Asparagus

1. Scope and Applicability

This PCR covers commercial production of fresh, unprocessed asparagus spears from establishment of a perennial stand through annual field management, harvest, grading, trimming, optional washing and packaging, and hand-off at the farm gate. Establishment burdens shall be linked to the productive years of the same stand. Nursery planting material sold as a product, processed asparagus, distribution beyond the farm gate, retail, cooking, and consumption are excluded.

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.agriculture-forestry-and-fishery-products.products-of-agriculture-horticulture-and-market-gardening.asparagus
classification_refs	CPC 3.0:01211 Asparagus; mapping relation: exact
covered_products	Fresh, unprocessed green, white, or purple asparagus spears at farm gate
excluded_products	Asparagus seed, crowns or transplants sold as planting material, and canned, frozen, pickled, dried, cooked, or otherwise processed asparagus
representative_product	Marketable fresh asparagus spears, trimmed and graded for the declared market
production_route	Perennial stand establishment, annual managed production, repeated spear harvest, and farm-gate preparation
market_state	Fresh, unprocessed produce at farm gate, loose or in declared primary packaging

3. Reference Flow

Field	Value
What	Marketable fresh asparagus spears at farm gate
How much	1,000 kg
How well	Fresh, unprocessed, and saleable under declared grade, colour, size, trimming, and defect criteria
How long or cycle	One declared harvest year, with establishment attributed across the declared productive stand life
reference_flow_link	asparagus_farm_gate_output

Field	Value
Reference amount	1000
Reference product flow	Asparagus 3a8d74d8-77a2-4242-b9d3-c0d1b2141b81
Reference flow property	Mass 93a60a56-a3c8-11da-a746-0800200b9a66
Reference unit group	Units of mass 93a60a57-a4c8-11da-a746-0800200c9a66
Reference unit	kg
Required qualifiers	farm-gate hand-off; production geography; production year and stand age; colour route (green/white/purple); harvest period; grade and size criteria; trimming state; washed or unwashed; packaging state

When constructing a foreground data package, the items listed in Required qualifiers must be declared in dataset metadata, process notes, reference flow comment, product description, or an equivalent data package field. Missing required qualifiers make the reference flow definition incomplete for that data package.

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
reference_product_mass	harvested and farm-gate asparagus	Mass 93a60a56-a3c8-11da-a746-0800200b9a66	kg	Keep gross harvested, marketable fresh, rejected fresh, and dry residue masses distinct.
area_normalization	establishment and field-year records	Area and mass	ha and kg	Record quantities by field and year before normalizing them to marketable output from the corresponding stand and year.
nutrient_basis	fertilizer inputs	Mass	kg N, kg P2O5, or kg K2O	Convert product mass only from documented nutrient concentration and preserve each nutrient basis.
planting_material_count	crowns and transplants	Number of items	plant	Record viable units; do not infer mass from count without a documented conversion.

5. System Boundary

Boundary Abstraction

Field	Value
declared_starting_condition	Prepared agricultural field receiving crowns or transplants, with prior land use and excluded pre-plant operations disclosed
starting_condition_role	Beginning of perennial stand establishment and productive-life attribution
product_classification_scope	Fresh asparagus under CPC 3.0:01211 through farm-gate hand-off
recursive_input_rule	Purchased asparagus planting material is a distinct upstream product input and is linked once rather than recreated inside this PCR.
upstream_dataset_requirement	Require upstream datasets for planting material, fertilizers, amendments, crop-protection products, irrigation water, energy, and packaging when used.
disclosure	Declare prior land use, establishment year, stand age, productive-life assumption, irrigation system, nutrient basis, residue fate, harvest and grading method, washing, cooling, and packaging.

Boundary Rules

rule_id	Applies to	Rule	source_ids
boundary_perennial_stand	establishment and productive years	Include establishment and represented productive years; attribute establishment burdens using the declared stand life and output without double-counting replacement planting.	osu-asparagus-production; uc-asparagus-production
boundary_farm_gate	harvest and handling	End at transfer of marketable fresh asparagus at farm gate; include on-farm grading, trimming, washing, cooling, and packaging when performed before transfer.	penn-state-asparagus-production; umn-asparagus-harvest
boundary_field_emissions	managed soil and residues	Include applicable direct and indirect nitrogen emissions and returned-residue nitrogen using one declared method, avoiding double counting.	ipcc-2019-managed-soils
boundary_residue_fate	fern and rejected material	Distinguish field return, feed, composting, treatment, productive use, and disposal; an unspecified residue is not a co-product.	umn-asparagus-harvest; ipcc-2019-managed-soils

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
stand_establishment	Perennial stand establishment	required	once per established stand	foreground establishment	established productive area
annual_field_management	Annual asparagus field management	required	each represented production year	foreground managed biological production	managed hectare-year and harvest-ready spear mass
harvest_and_farm_gate_preparation	Harvest and farm-gate preparation	required	each represented harvest year	foreground harvest, grading, and hand-off	1,000 kg marketable fresh asparagus

Process: Perennial stand establishment (stand_establishment)

Inputs

Product flows

Urea fertilizer (stand_establishment_agricultural_nutrient_inputs_urea)

Collection scope and applicability for stand_establishment_agricultural_nutrient_inputs. The following concrete identities have separate cards and apply only when use or generation is evidenced inside the original process scope. They are not mandatory inputs or a default recipe. Document non-use; missing records are not zero. Add a separate concrete card for any other actual material instead of substituting one of these names or UUIDs. Preserve attribution and boundaries and avoid double counting components included in outsourced services.

Collect each fertilizer product separately. Preserve each actual product identity, quantity, formulation, nutrient composition, application event, and allocation; do not count a compound product more than once. Raw activity or stage basis: per hectare established; converted to 1,000 kg marketable asparagus using same-stand lifetime output.

Confirm identity, grade, state and unit from equipment, supplier and contemporaneous measurements; the product UUID does not establish actual use or upstream-provider compatibility. Count physical product mass once and retain moisture, N/P/K composition and application events; nutrient quantities are calculated attributes, not additional purchases of the same product. Give unlisted compound and organic fertilizers separate cards identified by formulation or feedstock.

• Selected flow: Urea 3f8850c0-f718-4c4b-8fcb-8fd42e03aa8e
• Flow property / unit: Mass / kg
• Amount rule: Collect raw quantities for this identity under cp_establishment_records and calculate the exchange per declared reference flow using the original attribution rules.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_establishment_records
• Sources: osu-asparagus-production; uc-ipm-asparagus-fertilization; fao-fertilizer-identities

Use this product identity only when the actual formulation and grade are compatible. Retain supplier composition and mass records; do not substitute nutrient mass, dilute solution mass or service activity for the product mass. The UUID alone supplies neither a dose nor an emission factor.

Ammonium sulfate fertilizer (stand_establishment_agricultural_nutrient_inputs_ammonium_sulfate)

Confirm identity, grade, state and unit from equipment, supplier and contemporaneous measurements; the product UUID does not establish actual use or upstream-provider compatibility. Count physical product mass once and retain moisture, N/P/K composition and application events; nutrient quantities are calculated attributes, not additional purchases of the same product. Give unlisted compound and organic fertilizers separate cards identified by formulation or feedstock.

• Selected flow: Ammonium sulfate 8c6f0cbb-16d7-4dc9-8d55-e8dea17d7faf
• Flow property / unit: Mass / kg
• Amount rule: Collect raw quantities for this identity under cp_establishment_records and calculate the exchange per declared reference flow using the original attribution rules.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_establishment_records
• Sources: osu-asparagus-production; uc-ipm-asparagus-fertilization; fao-fertilizer-identities

Use this product identity only when the actual formulation and grade are compatible. Retain supplier composition and mass records; do not substitute nutrient mass, dilute solution mass or service activity for the product mass. The UUID alone supplies neither a dose nor an emission factor.

Triple superphosphate fertilizer (stand_establishment_agricultural_nutrient_inputs_triple_superphosphate)

Confirm identity, grade, state and unit from equipment, supplier and contemporaneous measurements; the UUID remains unverified. Count physical product mass once and retain moisture, N/P/K composition and application events; nutrient quantities are calculated attributes, not additional purchases of the same product. Give unlisted compound and organic fertilizers separate cards identified by formulation or feedstock.

• Selected flow: Triple superphosphate fertilizer
• Flow property / unit: Mass / kg
• Amount rule: Collect raw quantities for this identity under cp_establishment_records and calculate the exchange per declared reference flow using the original attribution rules.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_establishment_records
• Sources: osu-asparagus-production; uc-ipm-asparagus-fertilization; fao-fertilizer-identities

Potassium chloride fertilizer (stand_establishment_agricultural_nutrient_inputs_potassium_chloride)

Confirm identity, grade, state and unit from equipment, supplier and contemporaneous measurements; the UUID remains unverified. Count physical product mass once and retain moisture, N/P/K composition and application events; nutrient quantities are calculated attributes, not additional purchases of the same product. Give unlisted compound and organic fertilizers separate cards identified by formulation or feedstock.

• Selected flow: Potassium chloride fertilizer
• Flow property / unit: Mass / kg
• Amount rule: Collect raw quantities for this identity under cp_establishment_records and calculate the exchange per declared reference flow using the original attribution rules.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_establishment_records
• Sources: osu-asparagus-production; uc-ipm-asparagus-fertilization; fao-fertilizer-identities

Cattle manure applied as fertilizer (stand_establishment_agricultural_nutrient_inputs_cattle_manure)

Confirm identity, grade, state and unit from equipment, supplier and contemporaneous measurements; the UUID remains unverified. Count physical product mass once and retain moisture, N/P/K composition and application events; nutrient quantities are calculated attributes, not additional purchases of the same product. Give unlisted compound and organic fertilizers separate cards identified by formulation or feedstock.

• Selected flow: Cattle manure applied as fertilizer
• Flow property / unit: Mass / kg
• Amount rule: Collect raw quantities for this identity under cp_establishment_records and calculate the exchange per declared reference flow using the original attribution rules.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_establishment_records
• Sources: osu-asparagus-production; uc-ipm-asparagus-fertilization; fao-organic-nutrients

Composted plant residues applied to soil (stand_establishment_agricultural_nutrient_inputs_plant_compost)

Confirm identity, grade, state and unit from equipment, supplier and contemporaneous measurements; the UUID remains unverified. Count physical product mass once and retain moisture, N/P/K composition and application events; nutrient quantities are calculated attributes, not additional purchases of the same product. Give unlisted compound and organic fertilizers separate cards identified by formulation or feedstock.

• Selected flow: Composted plant residues applied to soil
• Flow property / unit: Mass / kg
• Amount rule: Collect raw quantities for this identity under cp_establishment_records and calculate the exchange per declared reference flow using the original attribution rules.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_establishment_records
• Sources: osu-asparagus-production; uc-ipm-asparagus-fertilization; fao-organic-nutrients

Establishment irrigation water (establishment_irrigation_water)

Record delivered establishment irrigation separately from rainfall and annual irrigation.

• Selected flow: Irrigation water

• Flow property / unit: Volume / m3

• Amount rule: Meter delivered water by field and source.

• Value mode: Foreground record (foreground_record)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per hectare established.

• Normalization basis: per declared reference flow

• Basis kind: Crop cycle (crop_cycle)

• Evidence kind: Collected record (collected_record)

• Collection protocol: cp_establishment_records

• Sources: uc-ipm-asparagus-irrigation

• Range: Provisional establishment irrigation screen

  • Range role: Default estimate (default_estimate)
  • Lower: 0
  • Upper: 15240
  • Unit: m3/ha established
  • Basis: broad first-pass establishment water range pending field-meter records
  • Basis kind: Crop cycle (crop_cycle)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Waste flows

Elementary flows

Outputs

Product flows

Established productive asparagus stand (established_stand_output)

This internal hand-off records accepted productive area and is not the reference product.

• Selected flow: Established productive asparagus stand

• Flow property / unit: Area / ha

• Amount rule: Accepted area after failed plants and replacements are reconciled.

• Value mode: Calculated value (calculated_value)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per establishment campaign.

• Normalization basis: per declared reference flow

• Basis kind: Crop cycle (crop_cycle)

• Evidence kind: Calculated from collection (calculated_from_collection)

• Collection protocol: cp_establishment_records

• Sources: osu-asparagus-production

Waste flows

Elementary flows

Process: Annual asparagus field management (annual_field_management)

Inputs

Product flows

Urea fertilizer (annual_field_management_agricultural_nutrient_inputs_urea)

Collection scope and applicability for annual_field_management_agricultural_nutrient_inputs. The following concrete identities have separate cards and apply only when use or generation is evidenced inside the original process scope. They are not mandatory inputs or a default recipe. Document non-use; missing records are not zero. Add a separate concrete card for any other actual material instead of substituting one of these names or UUIDs. Preserve attribution and boundaries and avoid double counting components included in outsourced services.

Collect each fertilizer product separately. Preserve each actual product identity, quantity, formulation, nutrient composition, application event, and allocation; do not count a compound product more than once. Raw activity or stage basis: per managed hectare-year; converted to 1,000 kg marketable asparagus using same field-year output.

Confirm identity, grade, state and unit from equipment, supplier and contemporaneous measurements; the product UUID does not establish actual use or upstream-provider compatibility. Count physical product mass once and retain moisture, N/P/K composition and application events; nutrient quantities are calculated attributes, not additional purchases of the same product. Give unlisted compound and organic fertilizers separate cards identified by formulation or feedstock.

• Selected flow: Urea 3f8850c0-f718-4c4b-8fcb-8fd42e03aa8e
• Flow property / unit: Mass / kg
• Amount rule: Collect raw quantities for this identity under cp_field_year_records and calculate the exchange per declared reference flow using the original attribution rules.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_field_year_records
• Sources: osu-asparagus-production; uc-ipm-asparagus-fertilization; fao-fertilizer-identities

Use this product identity only when the actual formulation and grade are compatible. Retain supplier composition and mass records; do not substitute nutrient mass, dilute solution mass or service activity for the product mass. The UUID alone supplies neither a dose nor an emission factor.

Ammonium sulfate fertilizer (annual_field_management_agricultural_nutrient_inputs_ammonium_sulfate)

Confirm identity, grade, state and unit from equipment, supplier and contemporaneous measurements; the product UUID does not establish actual use or upstream-provider compatibility. Count physical product mass once and retain moisture, N/P/K composition and application events; nutrient quantities are calculated attributes, not additional purchases of the same product. Give unlisted compound and organic fertilizers separate cards identified by formulation or feedstock.

• Selected flow: Ammonium sulfate 8c6f0cbb-16d7-4dc9-8d55-e8dea17d7faf
• Flow property / unit: Mass / kg
• Amount rule: Collect raw quantities for this identity under cp_field_year_records and calculate the exchange per declared reference flow using the original attribution rules.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_field_year_records
• Sources: osu-asparagus-production; uc-ipm-asparagus-fertilization; fao-fertilizer-identities

Use this product identity only when the actual formulation and grade are compatible. Retain supplier composition and mass records; do not substitute nutrient mass, dilute solution mass or service activity for the product mass. The UUID alone supplies neither a dose nor an emission factor.

Triple superphosphate fertilizer (annual_field_management_agricultural_nutrient_inputs_triple_superphosphate)

Confirm identity, grade, state and unit from equipment, supplier and contemporaneous measurements; the UUID remains unverified. Count physical product mass once and retain moisture, N/P/K composition and application events; nutrient quantities are calculated attributes, not additional purchases of the same product. Give unlisted compound and organic fertilizers separate cards identified by formulation or feedstock.

• Selected flow: Triple superphosphate fertilizer
• Flow property / unit: Mass / kg
• Amount rule: Collect raw quantities for this identity under cp_field_year_records and calculate the exchange per declared reference flow using the original attribution rules.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_field_year_records
• Sources: osu-asparagus-production; uc-ipm-asparagus-fertilization; fao-fertilizer-identities

Potassium chloride fertilizer (annual_field_management_agricultural_nutrient_inputs_potassium_chloride)

Confirm identity, grade, state and unit from equipment, supplier and contemporaneous measurements; the UUID remains unverified. Count physical product mass once and retain moisture, N/P/K composition and application events; nutrient quantities are calculated attributes, not additional purchases of the same product. Give unlisted compound and organic fertilizers separate cards identified by formulation or feedstock.

• Selected flow: Potassium chloride fertilizer
• Flow property / unit: Mass / kg
• Amount rule: Collect raw quantities for this identity under cp_field_year_records and calculate the exchange per declared reference flow using the original attribution rules.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_field_year_records
• Sources: osu-asparagus-production; uc-ipm-asparagus-fertilization; fao-fertilizer-identities

Cattle manure applied as fertilizer (annual_field_management_agricultural_nutrient_inputs_cattle_manure)

Confirm identity, grade, state and unit from equipment, supplier and contemporaneous measurements; the UUID remains unverified. Count physical product mass once and retain moisture, N/P/K composition and application events; nutrient quantities are calculated attributes, not additional purchases of the same product. Give unlisted compound and organic fertilizers separate cards identified by formulation or feedstock.

• Selected flow: Cattle manure applied as fertilizer
• Flow property / unit: Mass / kg
• Amount rule: Collect raw quantities for this identity under cp_field_year_records and calculate the exchange per declared reference flow using the original attribution rules.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_field_year_records
• Sources: osu-asparagus-production; uc-ipm-asparagus-fertilization; fao-organic-nutrients

Composted plant residues applied to soil (annual_field_management_agricultural_nutrient_inputs_plant_compost)

Confirm identity, grade, state and unit from equipment, supplier and contemporaneous measurements; the UUID remains unverified. Count physical product mass once and retain moisture, N/P/K composition and application events; nutrient quantities are calculated attributes, not additional purchases of the same product. Give unlisted compound and organic fertilizers separate cards identified by formulation or feedstock.

• Selected flow: Composted plant residues applied to soil
• Flow property / unit: Mass / kg
• Amount rule: Collect raw quantities for this identity under cp_field_year_records and calculate the exchange per declared reference flow using the original attribution rules.
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Reference flow (reference_flow)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_field_year_records
• Sources: osu-asparagus-production; uc-ipm-asparagus-fertilization; fao-organic-nutrients

Annual irrigation water (annual_irrigation_water)

Record delivered water separately from rainfall, with source and irrigation technology declared.

• Selected flow: Irrigation water

• Flow property / unit: Volume / m3

• Amount rule: Meter delivered irrigation water by field-year.

• Value mode: Foreground record (foreground_record)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per managed hectare-year; converted to 1,000 kg marketable asparagus using same field-year output.

• Normalization basis: per declared reference flow

• Basis kind: Crop cycle (crop_cycle)

• Evidence kind: Collected record (collected_record)

• Collection protocol: cp_field_year_records

• Sources: uc-ipm-asparagus-irrigation

• Range: Regional annual irrigation screen

  • Range role: Typical range (typical_range)
  • Lower: 4570
  • Upper: 15240
  • Unit: m3/ha-year
  • Basis: annual applied irrigation across documented production regions
  • Basis kind: Crop cycle (crop_cycle)
  • Evidence kind: External source (external_source)
  • Sources: uc-ipm-asparagus-irrigation

Purchased field electricity (field_electricity_input)

Record purchased electricity for irrigation and field operations separately from water volume and fuel.

• Selected flow: Purchased electricity

• Flow property / unit: Energy / kWh

• Amount rule: Meter or allocate electricity to the field-year without counting pumping twice.

• Value mode: Foreground record (foreground_record)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per managed hectare-year; converted to 1,000 kg marketable asparagus using same field-year output.

• Normalization basis: per declared reference flow

• Basis kind: Crop cycle (crop_cycle)

• Evidence kind: Collected record (collected_record)

• Collection protocol: cp_field_year_records

• Sources:

• Range: Provisional electricity screen

  • Range role: Default estimate (default_estimate)
  • Lower: 0
  • Upper: 5000
  • Unit: kWh/ha-year
  • Basis: broad first-pass range dependent on irrigation lift and mechanization
  • Basis kind: Crop cycle (crop_cycle)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Waste flows

Elementary flows

Outputs

Product flows

Harvest-ready asparagus spears in field (harvest_ready_spears_output)

This internal hand-off is fresh spear mass ready for harvest, before farm-gate grading and trimming.

• Selected flow: Harvest-ready asparagus spears in field

• Flow property / unit: Mass / kg fresh spears

• Amount rule: Gross harvested mass plus separately measured field losses.

• Value mode: Calculated value (calculated_value)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per managed hectare-year; converted to 1,000 kg marketable asparagus using same field-year output.

• Normalization basis: per declared reference flow

• Basis kind: Crop cycle (crop_cycle)

• Evidence kind: Calculated from collection (calculated_from_collection)

• Collection protocol: cp_harvest_records

• Sources: osu-asparagus-production; uc-small-farms-asparagus

• Range: Productive-year yield screen

  • Range role: Typical range (typical_range)
  • Lower: 560
  • Upper: 4480
  • Unit: kg fresh spears/ha-year
  • Basis: early through mature productive years
  • Basis kind: Crop cycle (crop_cycle)
  • Evidence kind: External source (external_source)
  • Sources: osu-asparagus-production; uc-small-farms-asparagus

Waste flows

Senesced fern and asparagus field residue (fern_residue_output)

Record physical residue mass by destination, distinguishing field incorporation, removal, burning, composting, and other treatment.

• Selected flow: Senesced asparagus fern and field residue

• Flow property / unit: Mass / kg dry matter

• Amount rule: Measure or estimate dry matter and nitrogen content by destination.

• Value mode: Calculated value (calculated_value)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per managed hectare-year.

• Normalization basis: per declared reference flow

• Basis kind: Crop cycle (crop_cycle)

• Evidence kind: Calculated from collection (calculated_from_collection)

• Collection protocol: cp_field_year_records

• Sources: umn-asparagus-harvest; ipcc-2019-managed-soils

• Range: Provisional fern-residue screen

  • Range role: Default estimate (default_estimate)
  • Lower: 0
  • Upper: 15000
  • Unit: kg dry matter/ha-year
  • Basis: broad first-pass senesced-biomass range pending dry-matter and destination records
  • Basis kind: Crop cycle (crop_cycle)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Elementary flows

Direct nitrous oxide from managed soil (direct_n2o_air_output)

Calculate direct N2O from synthetic and organic nitrogen and returned residue nitrogen as a separate atmospheric output.

• Selected flow: Nitrous oxide to ambient air

• Flow property / unit: Mass / kg N2O

• Amount rule: Apply the declared applicable IPCC or accepted regional method and preserve N2O-N to N2O conversion.

• Value mode: Calculated value (calculated_value)

• Specificity: Scenario-specific (scenario_specific) Raw activity or stage basis: per 1,000 kg marketable asparagus; nitrogen input is the calculation driver.

• Normalization basis: per declared reference flow

• Basis kind: Reference flow (reference_flow)

• Evidence kind: Calculated from collection (calculated_from_collection)

• Collection protocol: cp_field_year_records

• Sources: ipcc-2019-managed-soils

• Range: Method screening interval for managed-soil N2O

  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 50
  • Unit: kg N2O/ha-year
  • Basis: non-negative first-pass interval pending site-specific nitrogen activity and factor selection
  • Basis kind: Crop cycle (crop_cycle)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Process: Harvest and farm-gate preparation (harvest_and_farm_gate_preparation)

Inputs

Product flows

Harvest-ready asparagus spears (harvest_ready_spears_input)

Use the internal hand-off from the same field-year and reconcile it to product and losses.

• Selected flow: Harvest-ready asparagus spears in field

• Flow property / unit: Mass / kg fresh spears

• Amount rule: Equal the corresponding harvest_ready_spears_output before harvest losses.

• Value mode: Calculated value (calculated_value)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per harvest campaign.

• Normalization basis: per declared reference flow

• Basis kind: Process output (process_output)

• Evidence kind: Calculated from collection (calculated_from_collection)

• Collection protocol: cp_harvest_records

• Sources: osu-asparagus-production; umn-asparagus-harvest

Washing water (washing_water_input)

Include make-up water only when washing occurs before farm-gate transfer.

• Selected flow: Washing water

• Flow property / unit: Volume / m3

• Amount rule: Meter make-up and recirculated water and retain wastewater linkage.

• Value mode: Foreground record (foreground_record)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per 1,000 kg marketable asparagus.

• Normalization basis: per declared reference flow

• Basis kind: Process output (process_output)

• Evidence kind: Collected record (collected_record)

• Collection protocol: cp_handling_records

• Sources:

• Range: Provisional washing-water screen

  • Range role: Default estimate (default_estimate)
  • Lower: 0
  • Upper: 100
  • Unit: m3/1,000 kg marketable asparagus
  • Basis: broad first-pass make-up and recirculated water range pending handling-meter records
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Waste flows

Elementary flows

Outputs

Product flows

Marketable fresh asparagus at farm gate (asparagus_farm_gate_output)

This is trimmed, graded, fresh, unprocessed asparagus transferred at the declared farm gate.

• Selected flow: Asparagus 3a8d74d8-77a2-4242-b9d3-c0d1b2141b81

• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg Raw output measurement and reconciliation: Verified scale mass after excluding harvest, trim, and reject losses.

• Amount rule: 1000 kg

• Value mode: Calculated value (calculated_value)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: 1,000 kg marketable fresh asparagus.

• Normalization basis: per declared reference flow

• Basis kind: Reference flow (reference_flow)

• Evidence kind: Calculated from collection (calculated_from_collection)

• Collection protocol: cp_handling_records

• Sources: penn-state-asparagus-production; osu-asparagus-production

Waste flows

Rejected and trimmed asparagus (rejected_asparagus_output)

Record rejected spears and trimmings by physical state and destination.

• Selected flow: Rejected and trimmed fresh asparagus material

• Flow property / unit: Mass / kg fresh material

• Amount rule: Measure reject and trim mass and declare field return, feed, composting, treatment, or disposal.

• Value mode: Foreground record (foreground_record)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per 1,000 kg marketable asparagus.

• Normalization basis: per declared reference flow

• Basis kind: Process output (process_output)

• Evidence kind: Collected record (collected_record)

• Collection protocol: cp_handling_records

• Sources: osu-asparagus-production

• Range: Provisional reject screen

  • Range role: Default estimate (default_estimate)
  • Lower: 0
  • Upper: 300
  • Unit: kg/1,000 kg marketable asparagus
  • Basis: broad first-pass range pending grade and trim records
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Elementary flows

7. Allocation and Co-product Handling

rule_id	Applies to	Rule	source_ids
allocation_establishment_over_life	stand establishment	Attribute establishment burdens across actual represented productive years and marketable output; disclose lifetime, failed area, replacement, and early termination without double counting.	osu-asparagus-production; uc-asparagus-production
allocation_market_and_rejects	harvest preparation	Reconcile incoming spear mass to marketable asparagus and rejected or trimmed material; treat rejects as waste unless a documented product specification, buyer, quantity, and destination establish a co-product.	osu-asparagus-production
allocation_secondary_output	valorized residue	For an intentional secondary product, report quantity and hand-off and apply an explicitly justified allocation or substitution method; no default economic value or avoided burden applies.

Concrete cards do not inherit numerical ranges from the former aggregate card. Determine quantities from original records, stock/meter reconciliation and the declared reference flow; no default quantity or numeric screen is supplied without evidence matching the identity, unit, period and boundary. Missing range evidence is a quality disclosure, not zero use or proof of completeness.

rule_id	Applies to	Rule	source_ids
allocation_residual_precedence	remaining common burden with no specified primary branch	Resolve any study-specific joint-product instruction in this PCR that has no specified primary branch using this precedence; retain an already explicitly prescribed category-specific primary method. First directly assign separable output-specific activities. For the remaining common burden B, use a physical driver d_i only when measured operation or biological-service records demonstrate the causal consumption represented by that driver. A product being weighable, valuable or lower grade alone is insufficient; do not switch arbitrarily between area, time, mass and revenue. For comparable grades receiving the same common handling, measured processed mass is applicable only with the same service demand, state and moisture basis demonstrated. Share a_i=d_i/sum(d_j); B_i=Ba_i. If no defensible causal physical driver exists for that common operation, use gate- and period-matched economic shares a_i=(q_ip_i)/sum(q_j*p_j), with the complete independently intended output set, compatible quantity/price units, currency, representative prices and values before output-specific downstream processing. Missing price or denominator evidence makes the allocated result incomplete, not a zero-priced product or a single-output system. Report shares summing to one and sensitivity to a material alternative; an alternative is not an interchangeable primary result. Waste, retained residues and internal transfers receive no co-product share, while their attributable production/handling burdens remain with the producing saleable route. Retain unallocated physical quantities and mass balances separately. This branch gives no automatic substitution credit; any separately scoped substitution analysis retains the gross inventory and its actual displaced-function evidence.	ghg-protocol-product-standard-2011

8. Foreground Data Collection, Calculation, and Quality Rules

Specific input identification before dataset completion

Identify the actual input for this operation from supplier specifications, equipment and primary records. This is a mandatory collection requirement, not an exchange. Before dataset completeness, represent each used material, formulated product, carrier or independently purchased service by one physically specific card with its native quantity/property; confirm a compatible UUID, or retain an explicit unresolved identity and do not claim a fully linked dataset. Do not substitute a conditional example for an unknown actual input, invent a recipe, omit required use or infer zero from missing records. Attribute shared use, reusable assets and inclusive services once; preserve the original stage/period and measured throughput link to final reference output. The former aggregate range is not a component limit or consumption default.

requirement_id	collection_protocol_id	Preserved collection scope
primary_packaging_input_specific_input	cp_handling_records	Operation harvest_and_farm_gate_preparation: Record flexible bands, sleeves, and bags supplied with the product by material; record rigid trays and crates separately. Original quantity method: Measure packaging issued to transferred product and identify returnable packaging separately.
rigid_packaging_input_specific_input	cp_handling_records	Operation harvest_and_farm_gate_preparation: Record rigid trays and crates supplied with the product by material and return cycle. Original quantity method: Measure packaging issued to transferred product, and record returnable-container turns separately.

Retain raw site, lot, cycle and stage quantities and denominators in each collection protocol. Reconcile stocks, losses, moisture and co-product attribution first, then normalize: normalized exchange = attributable raw exchange × declared reference quantity / accepted hand-off product quantity on the same boundary and measurement basis. Apply perennial-establishment and shared-operation attribution before this normalization. Never set an internal-transfer quantity equal to the final reference quantity. Per declared reference flow means the amount, unit and product state in section 3; the data package must declare its actual route and gate.

Data Collection Protocols

protocol_id	process_id	flow_role	record_type	raw_fields	collection_method	unit	frequency	temporal_coverage	site_scope	aggregation_rule	quality_evidence
cp_establishment_records	stand_establishment	planting material, nutrients, water, and accepted area	field, purchase, application, and meter records	field_id; date; planting_material_type; units_planted; failed_units; product_mass; nutrient_concentration; irrigation_volume; established_area	reconcile purchases and applications to each establishment field; Raw aggregation and attribution: sum by field and preserve failures and replacements	plant; kg; m3; ha	each operation	complete establishment campaign	every represented field	per declared reference flow	invoices, labels, meters, field maps, and acceptance records
cp_field_year_records	annual_field_management	nutrients, water, electricity, residues, and emission activity	field-year log, invoice, meter, and application record	field_id; year; stand_age; area; product_identity; product_mass; nutrient_concentration; irrigation_volume; electricity; residue_mass; dry_matter; residue_nitrogen; destination	reconcile all records to the same field-year; Raw aggregation and attribution: sum by field-year before reference-flow normalization	ha; kg; kg nutrient; m3; kWh	each event and annual close	full year including postharvest fern management	every represented productive field	per declared reference flow	invoices, labels, analyses, meters, and disposition records
cp_harvest_records	harvest_and_farm_gate_preparation	harvest-ready and gross harvested spears	harvest log and scale record	field_id; harvest_date; harvest_pass; gross_mass; field_loss; harvest_method; area	link every harvest lot to field and date; Raw aggregation and attribution: sum by field-year without merging stand ages before normalization	kg; ha	each harvest pass	complete harvest window	every represented field	per declared reference flow	calibrated scales and harvest tickets
cp_handling_records	harvest_and_farm_gate_preparation	water, packaging, marketable output, and rejects	lot, scale, meter, packaging, and waste records	lot_id; source_field; gross_input; wash_water; packaging_material; packaging_mass; marketable_mass; grade; colour; trim_state; reject_mass; reject_reason; destination	preserve lot-level mass and utility reconciliation through transfer; Raw aggregation and attribution: reconcile input, product, rejects, and mass change before aggregation primary_packaging_input_specific_input: Operation harvest_and_farm_gate_preparation: Record flexible bands, sleeves, and bags supplied with the product by material; record rigid trays and crates separately. Original quantity method: Measure packaging issued to transferred product and identify returnable packaging separately. Identify the actual input for this operation from supplier specifications, equipment and primary records. This is a mandatory collection requirement, not an exchange. Before dataset completeness, represent each used material, formulated product, carrier or independently purchased service by one physically specific card with its native quantity/property; confirm a compatible UUID, or retain an explicit unresolved identity and do not claim a fully linked dataset. Do not substitute a conditional example for an unknown actual input, invent a recipe, omit required use or infer zero from missing records. Attribute shared use, reusable assets and inclusive services once; preserve the original stage/period and measured throughput link to final reference output. The former aggregate range is not a component limit or consumption default. rigid_packaging_input_specific_input: Operation harvest_and_farm_gate_preparation: Record rigid trays and crates supplied with the product by material and return cycle. Original quantity method: Measure packaging issued to transferred product, and record returnable-container turns separately. Identify the actual input for this operation from supplier specifications, equipment and primary records. This is a mandatory collection requirement, not an exchange. Before dataset completeness, represent each used material, formulated product, carrier or independently purchased service by one physically specific card with its native quantity/property; confirm a compatible UUID, or retain an explicit unresolved identity and do not claim a fully linked dataset. Do not substitute a conditional example for an unknown actual input, invent a recipe, omit required use or infer zero from missing records. Attribute shared use, reusable assets and inclusive services once; preserve the original stage/period and measured throughput link to final reference output. The former aggregate range is not a component limit or consumption default.	kg; m3	each lot or shift	complete harvest and packing period	every represented handling line	per declared reference flow	calibrated scales, meters, grade inspection, and destination receipts
cp_phase1_environment_coverage	stand_establishment	managed environmental coverage by actual node	site/activity/method ledger	site and actual managed nodes; area; dated occupation intervals; co-users; establishment/immature history; actual prior/current land classes and transformation dates/areas; carbon-method coverage; upstream land coverage	Collect original records by the actual responsible production node and matched lot/period; retain provenance, method applicability and uncertainty. Reconcile with existing protocols and provider coverage, do not add duplicate events. Explicitly document inapplicability; absent evidence is a gap.	native activity units; kg N or substance; area/time as applicable	event and annual/lot reconciliation	matched production/cohort period	all actual managed-production nodes	apply applicable coverage calculations then final normalization once	original records, method worksheets and applicability evidence

Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
calc_establishment_attribution	establishment	Divide establishment quantity by attributed lifetime marketable output of the same stand and update expected years with actual years.	establishment quantity; cohort; productive-life assumption; annual output	establishment burden per kg marketable asparagus	osu-asparagus-production; uc-asparagus-production
calc_nutrient_equivalent	fertilizer inputs	Product mass multiplied by documented nutrient fraction equals kg N, P2O5, or K2O.	product mass; nutrient concentration; area	nutrient-equivalent input	uc-ipm-asparagus-fertilization; osu-asparagus-production
calc_field_normalization	annual inputs	Final field-year contribution = attributable complete field-year quantity / matched marketable asparagus output in kg * 1,000 kg. The quotient before scaling is a per-kg intensity only. Add establishment contributions already expressed per kg multiplied by 1,000 once; never divide an already normalized contribution by output again.	field-year quantity; marketable mass	quantity per 1,000 kg reference product
calc_product_balance	harvest and handling	Gross harvested mass plus or minus measured mass change equals marketable product plus rejects and trimmings.	gross, marketable, reject, trim, and mass-change records	reconciled output quantities
calc_managed_soil_emissions	managed-soil nitrogen emissions	Apply the declared applicable IPCC or accepted regional equations to synthetic, organic, and returned-residue nitrogen; preserve conversions and prevent double counting.	nitrogen activity data; factors; climate and management qualifiers	direct and indirect nitrogen emissions	ipcc-2019-managed-soils
planting_material_input_identity_and_fate	stand_establishment	For the original planting_material_input collection role at this operation, identify the actual physical form, species/material, composition, state and supply/treatment boundary before creating exchanges. Each seed lot, transplant, crown, cutting, larval stage, formulation, coating, preservative or separated residue actually used/generated requires its own concrete card where relevant to this role; these examples are alternatives, not a required recipe. Retain existing collection records and route-specific source evidence. Count-based planting records require measured or supplier-supported mass-per-unit when matched to a mass-based provider; retain count and mass as linked attributes rather than two purchases. Do not merge separate husk/shell or separate agents. A real mixed stream requires composition and recipient evidence and is counted once. Before completeness, record every applicable amount and native unit, link a compatible verified UUID or explicitly unresolved identity, preserve stock/return attribution, and normalize the attributable raw quantity once to the accepted reference output. Missing records are not zero; aggregate ranges are not individual-input defaults. Retained source-specific collection screen: 14800–34600 plants/ha; basis: viable planting units per established hectare. Apply only to the matching concrete form, route and numerator unit, not to all alternatives or final normalized exchange.	cp_establishment_records	Identity-specific exchanges and reconciled activity records	osu-asparagus-production; penn-state-asparagus-production
chemical_species_mass_accounting	elementary_nutrient_emissions	Final elementary exchanges use the mass of the identified substance and one actual receiving compartment. Keep nutrient/activity ledgers separate: species-specific N2O-N × 44/28 gives N2O, NH3-N × 17/14 gives NH3, nitrate-N × 62/14 gives nitrate, and phosphate-P × 95/31 gives phosphate. If the selected flow is elemental phosphorus instead, report kg P and convert phosphate mass by 31/95 only when that species basis is evidenced. Apply a conversion exactly once only when the method output is on the elemental basis; measured compound mass is not reconverted. Total nutrient losses cannot be assigned to a single species without a supported split, and residual/retained soil nutrient is not an emission. Keep direct/indirect pathway ledgers and avoid repeating a pathway already included in the chosen method or upstream inventory. Factor uncertainty ranges screen factors on their stated basis, not final compound amounts or admissible site emissions. Normalize the attributable compound mass once using the accepted reference quantity and the matched measured output. Unknown activity, identity or compartment remains an evidence gap and blocks a completeness claim.	cp_field_year_records; species-specific activity ledger, method pathway and factor basis, matched accepted output	Identity-specific exchanges and reconciled activity records

Environmental Coverage Calculation Rules

rule_id	Applies to	Formula or rule	Inputs	Output	source_ids
calc_managed_land_coverage	actual managed-production nodes	For each actual owned managed-production site, collect the occupied area and dated occupation intervals, including attributable establishment/immature and production periods. Occupation is area multiplied by actual duration, converted explicitly to the selected area-time unit (1 ha = 10,000 m2; time in years); hectares per crop-cycle alone are not an area-time result without duration. Partition or take the union of overlapping establishment/management intervals so the same area-time is counted once, with shares across actual co-users summing to one. Record evidenced land transformation separately by actual from/to land class, event area and date under the declared land-use method; transformation has area units and is not added to occupation. Planting, continued occupation or missing prior-land data do not establish a transformation or zero transformation. Preserve actual historical-event attribution and carbon-stock/emission method coverage where applicable; no invented land conversion or generic carbon credit. Instantiate separate compatible elementary identities with verified UUIDs or explicit unresolved identities; attribute once and normalize to the matched final reference. Purchased completed biological inputs inherit compatible upstream land coverage once instead of duplicating it locally. Missing applicable land identity, area, duration or prior-state evidence remains a completeness gap; documented no transformation is a valid absence.	cp_phase1_environment_coverage	attributed native environmental quantities per matched final reference

Data Quality Requirements

requirement_id	Applies to	Requirement	Evidence
dq_product_identity	reference product	Preserve farm-gate state, colour route, grade, size, trim, washing, packaging, geography, production year, and stand age.	lot specification and field records
dq_period_linkage	establishment and annual management	Link every field-year to one establishment cohort and disclose replacements, abandonment, productive years, and termination.	field map, planting record, and production history
dq_mass_balance	harvest and handling	Reconcile harvest-ready, gross, marketable, rejected, and trimmed masses and explain differences.	calibrated scales and lot records
dq_input_completeness	all foreground inputs	Preserve nutrient basis, irrigation source, electricity coverage, packaging material, and residue destination for every represented field or lot.	invoices, labels, meters, and logs
dq_method_transparency	calculations	Record method version, factors, productive-life denominator, exclusions, and replacement of provisional estimates.	calculation file and review record

9. Validation Rules

rule_id	Applies to	Rule	source_ids
validation_reference_identity	reference product	Use the verified Asparagus UUID, mass property, mass unit group, kg, and all required qualifiers.
validation_handoffs	process map	Link establishment to each field-year and make harvest-ready output equal its harvest input before losses.
validation_mass_balance	harvest and handling	Reconcile marketable output, rejects, trimmings, and mass change to gross harvested input within declared uncertainty.
validation_nutrients_emissions	annual management	Keep N, P2O5, and K2O distinct, document emission factors, and prevent returned-residue nitrogen double counting.	ipcc-2019-managed-soils
validation_parameterized_flows	parameterized rows	Verify each actual exchange against its concrete flow UUID, physical state, property and unit; preserve explicit unresolved identities when confirmation is unavailable.
validation_unmapped_flows	unmapped rows	Planting material, internal stand and spear states, fern residue, and rejects remain explicit coverage requirements until exact compatible identities are supplied.

10. Published Dataset Profile

Field	Value
dataset_role	foreground agricultural production dataset for fresh asparagus at farm gate
downstream_use	secondary_dataset; background_dataset after review and publication
allowed_use	fresh-asparagus crop and supply-chain studies with compatible geography, stand age, product state, and route
excluded_use	nursery planting material, processed asparagus, post-farm distribution, or comparisons omitting perennial establishment
required_metadata	geography; field area; establishment cohort; stand age; year; productive-life assumption; colour route; harvest and grade; irrigation; nutrient basis; residue fate; washing; cooling; packaging; farm-gate hand-off
required_quality_disclosure	primary-data coverage; scale and meter quality; lifetime attribution; mass balance; data gaps; provisional ranges; emission method; concrete flow identity verification; unmapped identities
update_trigger	verified identity, reviewed quantitative evidence, product specification, lifetime attribution, or managed-soil method changes

11. Data Sources

Source id	Type	Reference	Used for
osu-asparagus-production	extension_guidance	Oklahoma State University Extension, Asparagus Production, HLA-6018, https://extension.okstate.edu/fact-sheets/asparagus-production	stand life, establishment, planting density, nutrients, harvest, yield, and rejects
uc-ipm-asparagus-irrigation	extension_guidance	University of California Statewide IPM Program, Asparagus: Irrigation, https://ipm.ucanr.edu/agriculture/asparagus/irrigation/	irrigation systems and annual applied-water range
uc-ipm-asparagus-fertilization	extension_guidance	University of California Statewide IPM Program, Asparagus: Fertilization, UC ANR Publication 3435, https://ipm.ucanr.edu/agriculture/asparagus/fertilization/	establishment and maintenance nutrient ranges
uc-asparagus-production	extension_guidance	University of California ANR, Asparagus Production in California, Publication 7234, https://anrcatalog.ucanr.edu/pdf/7234.pdf	perennial production route and establishment boundary
uc-small-farms-asparagus	extension_guidance	University of California Small Farms Network, Asparagus, https://ucanr.edu/program/uc-small-farms-network/asparagus	production-year yield progression
penn-state-asparagus-production	extension_guidance	Penn State Extension, Asparagus Production, https://extension.psu.edu/asparagus-production	fresh market state, planting density, grade, and packaging
umn-asparagus-harvest	extension_guidance	University of Minnesota Extension, Harvesting Asparagus, https://extension.umn.edu/agriculture/specialty-crops/vegetable-farming/harvesting-asparagus	harvest boundary and postharvest fern management
ipcc-2019-managed-soils	official_guidance	IPCC, 2019 Refinement, Volume 4, Chapter 11, https://www.ipcc-nggip.iges.or.jp/public/2019rf/pdf/4_Volume4/19R_V4_Ch11_Soils_N2O_CO2.pdf	managed-soil nitrogen emissions and residue nitrogen
fao-fertilizer-identities	official_guidance	FAO Fertilizer Specifications, https://www.fao.org/agriculture/crops/thematic-sitemap/theme/spi/plantnutrition/fertspecs/en/	conditional concrete identities and method context; does not establish site use or quantities
fao-organic-nutrients	official_guidance	FAO How to Make and Use Compost, https://www.fao.org/4/i2230e/i2230e.pdf	conditional concrete identities and method context; does not establish site use or quantities
ghg-protocol-product-standard-2011	standard	WRI/WBCSD, Product Life Cycle Accounting and Reporting Standard (2011), Chapter 9, https://ghgprotocol.org/sites/default/files/standards/Product-Life-Cycle-Accounting-Reporting-Standard_041613.pdf	General allocation hierarchy and comparable-gate economic basis. Applicability conditions and the explicit residual branch are this PCR's method convention; no product-specific causal coefficient, price or output quantity is prescribed by this source.