Buckwheat grain

1. Scope and Applicability

This PCR covers cultivated buckwheat grain delivered at the farm gate after harvest and any on-farm cleaning or drying needed to reach the declared market state. It applies to grain grown as a food, feed, or further-processing crop, under rainfed or irrigated management. It excludes certified seed production, green-manure or cover-crop service, forage, hay, silage, grazing, buckwheat honey service, off-farm storage and transport, milling, dehulling, flour, groats, and prepared food.

2. Product Category Identity

Field	Value
canonical_pcr_id	pcr.agriculture-forestry-and-fishery-products.products-of-agriculture-horticulture-and-market-gardening.buckwheat
classification_refs	CPC 3.0: 01192 Buckwheat; mapping relation: narrower
covered_products	harvested buckwheat grain for food, feed, or further processing, at the farm gate
excluded_products	certified buckwheat seed; cover-crop, green-manure, forage, hay, silage, grazing, or pollination service; dehulled groats, flour, prepared foods, and downstream logistics
representative_product	unprocessed harvested buckwheat grain
production_route	managed buckwheat cultivation, harvest, and conditional on-farm grain conditioning
market_state	unprocessed grain at farm gate, with moisture, impurity, damage, and intended-use state declared

3. Reference Flow

Field	Value
What	buckwheat grain at the farm gate
How much	1,000 kg as-received grain
How well	harvested, unprocessed grain meeting declared moisture, impurity, damage, and intended-use specifications
How long or cycle	one declared crop cycle
reference_flow_link	reference_product_at_declared_handoff

Field	Value
Reference amount	1000
Reference product flow	Buckwheat, production mix, at farm gate, harvested grain, unprocessed
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	cultivar or variety; production geography; harvest year; crop season; moisture at hand-off; impurity and damage basis; intended use; conditioning included or excluded

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.

Each foreground dataset must explicitly select one actual route, declared gate, product state and output row. Reconcile the selected terminal route with reference_product_at_declared_handoff; normalize that handoff output to the reference quantity and retain preceding-stage outputs as measured transfers. Raw weighing, mass reconciliation and lot traceability requirements continue to apply.

The sole reference output is reference_product_at_declared_handoff, receiving the selected actual route product at the declared gate. Existing route-output ids identify the source and physical state; they are no longer individually fixed to the reference quantity.

4. Measurement and Unit Rules

rule_id	Applies to	Required property	Required unit	Rule
reference_mass_as_received	reference buckwheat grain	Mass	kg	Report as-received mass and measured moisture; retain the moisture basis for every dry-matter conversion.
area_to_reference_conversion	area-based field flows	activity-specific property	activity-specific unit	Divide crop-cycle totals per hectare by marketable grain yield on the same area and cycle before scaling to 1,000 kg grain.
nutrient_content_basis	nutrient applications	nutrient mass	kg N, kg P2O5, or kg K2O	Preserve formulated product mass and declared nutrient-content basis as separate fields.

5. System Boundary

Boundary Abstraction

Field	Value
declared_starting_condition	prepared field at the start of the buckwheat crop cycle, with seed and purchased management inputs crossing the foreground boundary
starting_condition_role	start of managed buckwheat grain production
product_classification_scope	cultivated buckwheat grain corresponding to CPC 3.0 code 01192
recursive_input_rule	purchased or retained buckwheat for sowing is an explicit seed input linked to a distinct upstream seed-supply dataset and must not loop to this grain process
upstream_dataset_requirement	compatible upstream datasets for seed, fertilizers, crop-protection formulations, fuels, electricity, irrigation supply, and contracted services
disclosure	cultivar, crop season, geography, field area, crop dates, previous crop, tillage, irrigation, yield, moisture, residue fate, and conditioning boundary

Boundary Rules

rule_id	Applies to	Rule	source_ids
boundary_crop_cycle_to_farm_gate	all conforming datasets	Include field preparation, sowing, crop management, harvest, and on-farm cleaning or drying performed before the farm-gate hand-off.	cornell-buckwheat-production
boundary_direct_field_emissions	managed soil emissions	Include direct and indirect nitrogen-related emissions using a geographically applicable method and the same activity data used for nutrient and residue accounting.	ipcc-2019-managed-soils; emep-eea-2023-guidebook
boundary_residue_fate	straw and crop residues	Distinguish residues returned to soil, burned, removed as product, and removed as waste; prevent double counting residue nitrogen and exported straw.	ipcc-2019-managed-soils
boundary_post_farm_gate_exclusion	downstream activities	Exclude off-farm transport, storage, dehulling, milling, flour or groat production, feed manufacture, food processing, and use unless the study explicitly extends beyond this PCR.

6. Process Inventory Structure

Process Map

process_id	process_name	inclusion	inclusion_condition	role	quantitative_reference
buckwheat_field_production	Buckwheat field production and harvest	required	always	managed biological production and harvest	cultivated hectare and harvested grain mass for one crop cycle
farm_gate_buckwheat_conditioning	On-farm buckwheat grain conditioning	conditional	cleaning, drying, sorting, or temporary handling occurs before farm-gate hand-off and is not embedded in field records	prepare harvested grain to declared market state	incoming and accepted grain mass
declared_reference_handoff	Product Measurement at Declared Handoff	required		foreground	reference_product_at_declared_handoff

Process: Buckwheat field production and harvest (buckwheat_field_production)

Inputs

Product flows

Buckwheat seed for sowing (buckwheat_seed_input)

Record purchased or retained buckwheat seed crossing into the crop cycle. Do not substitute the harvested-grain identity for seed identity.

• Selected flow: Buckwheat seed for sowing

• Flow property / unit: Mass / kg

• Amount rule: measured seed mass sown

• Value mode: Foreground record (foreground_record)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per cultivated hectare and converted with same-cycle yield.

• Normalization basis: per declared reference flow

• Basis kind: Crop cycle (crop_cycle)

• Evidence kind: Collected record (collected_record)

• Collection protocol: cp_field_activity_records

• Sources:

• Range: Provisional author seeding-rate estimate; not a published empirical interval

  • Range role: Typical range (typical_range)
  • Lower: 45
  • Upper: 100
  • Unit: kg seed/ha
  • Basis: drilled or comparable establishment; document justified rates outside the range
  • Basis kind: Crop cycle (crop_cycle)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Urea fertilizer (buckwheat_field_production_agricultural_nutrient_inputs_urea)

Collection scope and applicability for buckwheat_field_production_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 cultivated hectare and converted to 1,000 kg grain.

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_activity_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_activity_records
• Sources: 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 (buckwheat_field_production_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_activity_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_activity_records
• Sources: 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 (buckwheat_field_production_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_activity_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_activity_records
• Sources: fao-fertilizer-identities

Potassium chloride fertilizer (buckwheat_field_production_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_activity_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_activity_records
• Sources: fao-fertilizer-identities

Cattle manure applied as fertilizer (buckwheat_field_production_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_activity_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_activity_records
• Sources: fao-organic-nutrients

Composted plant residues applied to soil (buckwheat_field_production_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_activity_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_activity_records
• Sources: fao-organic-nutrients

Irrigation water supplied (irrigation_water_input)

Record irrigation only where water is applied to the buckwheat field; rainfed production records zero applied irrigation with supporting field evidence.

• Selected flow: Irrigation water supply

• Flow property / unit: Volume / m3

• Amount rule: metered or calculated irrigation volume by field and crop cycle

• Value mode: Foreground record (foreground_record)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per cultivated hectare and converted to 1,000 kg grain.

• Normalization basis: per declared reference flow

• Basis kind: Crop cycle (crop_cycle)

• Evidence kind: Collected record (collected_record)

• Collection protocol: cp_field_activity_records

• Range: Provisional irrigation screen

  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 300
  • Unit: m3/ha
  • Basis: one crop cycle; replace with local water-balance evidence
  • Basis kind: Crop cycle (crop_cycle)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Diesel for field machinery (field_diesel_input)

Record diesel consumed by field preparation, sowing, crop care, and harvest machinery when fuel use crosses the foreground boundary.

• Selected flow: Diesel fuel 9d258d75-6792-4f1c-9856-81602ed8f816

• Flow property / unit: Mass 93a60a56-a3c8-11da-a746-0800200b9a66 / kg

• Amount rule: tank records, invoices, or contractor activity converted to fuel mass or energy with the carrier identity retained

• Value mode: calculated_value

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per cultivated hectare and converted to 1,000 kg grain.

• Normalization basis: per declared reference flow

• Basis kind: Crop cycle (crop_cycle)

• Evidence kind: calculated_from_collection

• Collection protocol: cp_field_activity_records

Only actual diesel is represented by this card; other fuels or an inclusive contracted service require their own separate identities and must not also be charged here. The linked quantity is kg of diesel: preserve raw tank/invoice units; calculate kg = L × documented density in kg/L at the recorded temperature, or kg = MJ / documented diesel lower heating value in MJ/kg on the same energy basis. Direct mass records require no carrier conversion. Missing density or heating value must be obtained, never assumed. Apply measured area, period and accepted-output normalization once after carrier conversion, retaining the original final reference amount. No universal per-hectare fuel screen is imposed.

Waste flows

Elementary flows

Outputs

Product flows

Harvested buckwheat grain at farm gate (harvested_buckwheat_grain_output)

Record saleable or transferred harvested grain at the declared farm-gate moisture and impurity state. This is the terminal reference output when no conditioning process is included.

• Selected flow: Buckwheat, production mix, at farm gate, harvested grain, unprocessed 7f337a9e-f24a-4d48-841e-0b5326d028d7

• Flow property / unit: Mass / kg Raw output measurement and reconciliation: measured harvested grain mass at declared moisture and quality state

• Amount rule: measured net transfer mass, retaining lot, actual product state and moisture basis; reconcile to the final reference output at the declared handoff

• Value mode: Foreground record (foreground_record)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: terminal output scaled to 1,000 kg reference grain.

• Normalization basis: per declared reference flow

• Basis kind: Reference flow (reference_flow)

• Evidence kind: Collected record (collected_record)

• Collection protocol: cp_harvest_output_records

• Sources:

• Range: Provisional harvested-grain yield screen

  • Range role: QA guardrail (qa_guardrail)
  • Lower: 500
  • Upper: 3,000
  • Unit: kg grain/ha
  • Basis: one crop cycle; replace with regional yield records
  • Basis kind: Crop cycle (crop_cycle)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Buckwheat straw removed for declared use (buckwheat_straw_output)

Record straw as a product only when it is deliberately removed from the field and transferred to a named use; residues retained or incorporated in the field remain part of field management.

• Selected flow: Buckwheat straw for declared use

• Flow property / unit: Mass / kg dry or as-received straw

• Amount rule: measured removed straw mass by destination and moisture basis

• Value mode: Foreground record (foreground_record)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per cultivated hectare and converted to 1,000 kg grain.

• Normalization basis: per declared reference flow

• Basis kind: Crop cycle (crop_cycle)

• Evidence kind: Collected record (collected_record)

• Collection protocol: cp_harvest_output_records

• Sources:

• Range: Provisional removed-straw screen

  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 4,000
  • Unit: kg straw/ha
  • Basis: zero where all residues remain in the field; declare destination and moisture basis
  • Basis kind: Crop cycle (crop_cycle)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Waste flows

Harvest and field losses (harvest_loss_waste_output)

Record grain and other harvest losses as waste when they are measured or estimated from a documented field or harvest balance and do not become a useful co-product.

• Selected flow: Buckwheat harvest loss waste

• Flow property / unit: Mass / kg

• Amount rule: measured or reconciled loss mass by destination

• Value mode: Calculated value (calculated_value)

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

• Normalization basis: per declared reference flow

• Basis kind: Process output (process_output)

• Evidence kind: Calculated from collection (calculated_from_collection)

• Collection protocol: cp_harvest_output_records

• Sources:

• Range: Provisional harvest-loss screen

  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 150
  • Unit: kg/1,000 kg harvested grain
  • Basis: field and harvest losses not transferred to a declared use
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Elementary flows

Nitrous oxide released to ambient air (field_n2o_air_output)

Calculate soil nitrous oxide from collected nitrogen inputs and residue activity using an applicable IPCC tier or reviewed regional method.

• Selected flow: Nitrous oxide emission to ambient air

• Flow property / unit: Mass / kg N2O

• Amount rule: calculated from collected activity data and declared factors

• Value mode: Calculated value (calculated_value)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per cultivated hectare and converted to 1,000 kg grain.

• Normalization basis: per declared reference flow

• Basis kind: N input (n_input)

• Evidence kind: Calculated from collection (calculated_from_collection)

• Collection protocol: cp_field_emission_activity

• Sources: ipcc-2019-managed-soils

Ammonia released to ambient air (field_ammonia_air_output)

Calculate ammonia volatilization by nutrient product, application method, timing, and applicable local method.

• Selected flow: Ammonia emission to ambient air

• Flow property / unit: Mass / kg NH3

• Amount rule: calculated from nitrogen application records and applicable factors

• Value mode: Calculated value (calculated_value)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per cultivated hectare and converted to 1,000 kg grain.

• Normalization basis: per declared reference flow

• Basis kind: N input (n_input)

• Evidence kind: Calculated from collection (calculated_from_collection)

• Collection protocol: cp_field_emission_activity

• Sources: emep-eea-2023-guidebook

Nitrate released to water (field_nitrate_water_output)

Record nitrate leaching or runoff only when supported by a geographically applicable model, monitored balance, or reviewed inventory method.

• Selected flow: Nitrate emission to water

• Flow property / unit: Mass / kg nitrate

• Amount rule: calculated from nitrogen inputs, crop and soil conditions, drainage or runoff, and selected method

• Value mode: Calculated value (calculated_value)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per cultivated hectare and converted to 1,000 kg grain.

• Normalization basis: per declared reference flow

• Basis kind: N input (n_input)

• Evidence kind: Calculated from collection (calculated_from_collection)

• Collection protocol: cp_field_emission_activity

• Sources: ipcc-2019-managed-soils

Process: On-farm buckwheat grain conditioning (farm_gate_buckwheat_conditioning)

Inputs

Product flows

Harvested grain entering conditioning (harvested_grain_conditioning_input)

Record measured grain transferred from field production into cleaning, drying, sorting, or temporary handling before the farm-gate hand-off.

• Selected flow: Buckwheat, production mix, at farm gate, harvested grain, unprocessed 7f337a9e-f24a-4d48-841e-0b5326d028d7

• Flow property / unit: Mass / kg

• Amount rule: measured incoming grain mass and moisture

• Value mode: Foreground record (foreground_record)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: per conditioning batch and converted to 1,000 kg accepted grain.

• Normalization basis: per declared reference flow

• Basis kind: Process output (process_output)

• Evidence kind: Collected record (collected_record)

• Collection protocol: cp_conditioning_records

Electricity supplied to conditioning (conditioning_electricity_input)

Record electricity used by cleaning, conveying, ventilation, and drying controls.

• Selected flow: Electricity supply for grain conditioning

• Flow property / unit: Energy / kWh

• Amount rule: metered electricity or equipment power multiplied by verified operating time

• Value mode: Calculated value (calculated_value)

• Specificity: Technology-specific (technology_specific) Raw activity or stage basis: per 1,000 kg accepted grain.

• Normalization basis: per declared reference flow

• Basis kind: Process output (process_output)

• Evidence kind: Calculated from collection (calculated_from_collection)

• Collection protocol: cp_conditioning_records

• Range: Provisional conditioning-electricity screen

  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 150
  • Unit: kWh/1,000 kg grain
  • Basis: included conditioning before farm-gate hand-off
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Thermal energy supplied to drying (conditioning_heat_input)

Record supplied heat or fuel energy used to reduce grain moisture.

• Selected flow: Process heat for grain drying

• Flow property / unit: Energy / MJ

• Amount rule: measured fuel or heat converted to delivered energy while retaining carrier identity

• Value mode: Calculated value (calculated_value)

• Specificity: Technology-specific (technology_specific) Raw activity or stage basis: per 1,000 kg accepted grain.

• Normalization basis: per declared reference flow

• Basis kind: Process output (process_output)

• Evidence kind: Calculated from collection (calculated_from_collection)

• Collection protocol: cp_conditioning_records

• Range: Provisional drying-energy screen

  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 1,200
  • Unit: MJ/1,000 kg grain
  • Basis: zero without active drying; broad candidate estimate
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Waste flows

Elementary flows

Outputs

Product flows

Conditioned buckwheat grain at farm gate (conditioned_buckwheat_grain_output)

Record accepted grain after included cleaning or drying at the declared farm-gate state.

• Selected flow: Buckwheat, production mix, at farm gate, harvested grain, unprocessed 7f337a9e-f24a-4d48-841e-0b5326d028d7

• Flow property / unit: Mass / kg Raw output measurement and reconciliation: measured accepted grain mass at declared moisture and impurity

• Amount rule: measured net transfer mass, retaining lot, actual product state and moisture basis; reconcile to the final reference output at the declared handoff

• Value mode: Foreground record (foreground_record)

• Specificity: Site-specific (site_specific) Raw activity or stage basis: terminal output scaled to 1,000 kg reference grain.

• Normalization basis: per declared reference flow

• Basis kind: Reference flow (reference_flow)

• Evidence kind: Collected record (collected_record)

• Collection protocol: cp_conditioning_records

• Sources:

• Range: Storage-moisture QA screen

  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 14
  • Unit: percent moisture, wet basis
  • Basis: market state must be declared; replace this broad screen with buyer or storage specification
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Buckwheat screenings directed to use (buckwheat_screenings_output)

Record buckwheat-dominant screenings or broken kernels as a product only when measured and deliberately handed off for feed or another declared use.

• Selected flow: Buckwheat grain screenings for declared use

• Flow property / unit: Mass / kg

• Amount rule: measured useful screenings by destination

• Value mode: Foreground record (foreground_record)

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

• Normalization basis: per declared reference flow

• Basis kind: Process output (process_output)

• Evidence kind: Collected record (collected_record)

• Collection protocol: cp_conditioning_records

• Sources:

• Range: Provisional useful-screenings screen

  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 150
  • Unit: kg/1,000 kg incoming grain
  • Basis: conditioning batch; zero when no useful screenings are handed off
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Waste flows

Foreign matter and rejected grain (conditioning_reject_waste_output)

Record removed stones, soil, weed material, contaminated grain, and other rejects by material class and destination.

• Selected flow: Grain-conditioning foreign matter and rejected grain

• Flow property / unit: Mass / kg

• Amount rule: measured reject mass by material class and destination

• Value mode: Foreground record (foreground_record)

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

• Normalization basis: per declared reference flow

• Basis kind: Process output (process_output)

• Evidence kind: Collected record (collected_record)

• Collection protocol: cp_conditioning_records

• Sources:

• Range: Provisional conditioning-reject screen

  • Range role: QA guardrail (qa_guardrail)
  • Lower: 0
  • Upper: 150
  • Unit: kg/1,000 kg incoming grain
  • Basis: conditioning batch
  • Basis kind: Process output (process_output)
  • Evidence kind: Reasoned estimate (reasoned_estimate)

Elementary flows

Process: Product Measurement at the Declared Handoff (declared_reference_handoff)

This node records the actual product handoff at the existing system boundary for reconciliation and reference-quantity normalization. It adds no physical processing and does not presume drying, cooling, storage, packaging or transport. Each data package declares one actual route, one terminal product state, moisture or dry-matter basis, and gate. Feed only the accepted product delivered by that route at that gate into this node; do not add other routes as extra inputs. Record co-products separately and apply Section 7. Count preceding inputs, losses and emissions once. Normalize using the measured accepted net mass at the handoff; this measurement node changes neither mass, yield nor allocation.

Inputs

Product flows

Actual route product at handoff (actual_route_product_for_handoff)

Record the accepted product delivered by the actual terminal route and reconcile it with handoff weighing and lot records.

• Selected flow: Buckwheat, production mix, at farm gate, harvested grain, unprocessed
• Flow property / unit: Mass / kg
• Amount rule: measured accepted net product mass at the actual handoff, normalized to the reference quantity; do not sum preceding-stage quantities, other routes or co-products
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Process output (process_output)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_declared_reference_handoff
• Range: Handoff quantity normalization identity
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 1
  • Upper: 1
  • Unit: kg/kg net handoff mass of the same state
  • Basis: normalization of the measured net mass of the same handoff state; not a physical-operation yield
  • Basis kind: Process output (process_output)
  • Evidence kind: Method formula (method_formula)
  • Sources: declared-handoff-measurement-definition

Waste flows

This measurement node adds no waste inputs.

Elementary flows

This measurement node adds no resource inputs.

Outputs

Product flows

Reference product at declared handoff (reference_product_at_declared_handoff)

• Selected flow: Buckwheat, production mix, at farm gate, harvested grain, unprocessed
• Flow property / unit: Mass / kg
• Amount rule: 1000 kg
• Value mode: Foreground record (foreground_record)
• Specificity: Site-specific (site_specific)
• Normalization basis: per declared reference flow
• Basis kind: Process output (process_output)
• Evidence kind: Collected record (collected_record)
• Collection protocol: cp_declared_reference_handoff Confirm the product UUID independently for the actual state. Until confirmed, retain unresolved identity instead of inheriting a UUID from a preceding stage or another route.
• Range: Handoff quantity normalization identity
  • Range role: QA guardrail (qa_guardrail)
  • Lower: 1
  • Upper: 1
  • Unit: kg/kg net handoff mass of the same state
  • Basis: normalization of the measured net mass of the same handoff state; not a physical-operation yield
  • Basis kind: Process output (process_output)
  • Evidence kind: Method formula (method_formula)
  • Sources: declared-handoff-measurement-definition

Waste flows

Record actual losses at the operation where they occur; do not duplicate them here.

Elementary flows

Record actual emissions at the operation where they occur; do not duplicate them here.

7. Allocation and Co-product Handling

rule_id	Applies to	Rule	source_ids
allocation_avoid_by_subdivision	field production and conditioning	Prefer separate records for field production and conditioning and separate measurement of grain, screenings, straw, and waste before allocation.	iso-14044-2006
allocation_field_residue	residues retained, incorporated, or burned	Do not treat retained residues as co-products; include their management and emissions in field production and prevent double counting with removed straw.	ipcc-2019-managed-soils
allocation_removed_straw	marketable removed straw	If subdivision cannot resolve shared burdens, apply economic allocation using contemporaneous farm-gate values; disclose moisture bases and test mass allocation as sensitivity.	iso-14044-2006
allocation_conditioning_outputs	useful screenings or downgraded grain	Treat an intended output with positive value as co-product and other rejects as waste; use economic allocation at conditioning hand-off only when subdivision is infeasible.	iso-14044-2006

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.

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
crop_protection_input_specific_input	cp_field_activity_records	Operation buckwheat_field_production: Record each herbicide, insecticide, fungicide, or other formulation separately when applied; do not aggregate distinct products into a generic crop-protection identity. Original quantity method: sum measured formulation mass by product and application event

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_field_activity_records	buckwheat_field_production	seed, nutrients, irrigation, fuel, crop protection	field log, invoice, application record, meter, or contractor record	field_id; area; cultivar; input_product; amount; nutrient_content; date; operation; contractor_scope	reconcile physical inputs and operations to each field and crop cycle; Raw aggregation and attribution: sum by physical identity; calculate nutrients without merging products; normalize with same-cycle area and yield crop_protection_input_specific_input: Operation buckwheat_field_production: Record each herbicide, insecticide, fungicide, or other formulation separately when applied; do not aggregate distinct products into a generic crop-protection identity. Original quantity method: sum measured formulation mass by product and application event 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; kg nutrient; L; m3; ha	each event	complete crop cycle	all represented fields	per declared reference flow	invoices; labels; calibrated meters; field logs
cp_harvest_output_records	buckwheat_field_production	grain, removed straw, harvest losses, residue fate	weighbridge, yield monitor, bale record, moisture test	field_id; harvest_date; grain_mass; grain_moisture; straw_mass; straw_moisture; loss_mass; residue_fate; destination	reconcile harvest and removed masses to field area and crop cycle; Raw aggregation and attribution: sum accepted grain, each residue destination, and losses separately	kg; percent; ha	each harvest	complete crop cycle	all represented fields	per declared reference flow	scale or yield-monitor calibration; moisture records; destination evidence
cp_field_emission_activity	buckwheat_field_production	emissions to air and water	nutrient, soil, weather, residue, and emission-model records	fertilizer_N; organic_N; residue_N; application_method; soil; climate; drainage; factor_set; model_version	Within each compatible route/product/state, calculate attributable raw totals by field first. Aggregate final intensity = sum(attributable raw quantities) * declared reference quantity / sum(matched accepted final outputs). When source quantities are per-ha rates e_h and y_h, first recover raw totals as e_harea and y_harea; do not area-weight field totals again. A per-product intensity is weighted by its matched output, not area or an unweighted mean. Apply existing allocation once, preserve period/throughput and all source-unit conversions, and keep incompatible routes separate.	kg N; kg emission; ha	each event and crop-cycle calculation	complete crop cycle	all represented fields	per declared reference flow	source records; factor provenance; model file; nutrient-balance review
cp_conditioning_records	farm_gate_buckwheat_conditioning	grain, energy, screenings, rejects	batch ticket, scale, moisture test, meter, fuel, and destination record	batch_id; incoming_mass; incoming_moisture; electricity; heat; accepted_mass; accepted_moisture; screenings; rejects	reconcile batches and meters to accepted output; Raw aggregation and attribution: sum matched batches; allocate shared meters by time or processed mass; close wet-mass balance	kg; percent; kWh; MJ	each batch or meter period	all pre-gate conditioning	all included equipment and batches	per declared reference flow	calibrated scales and moisture meters; meter reconciliation
cp_declared_reference_handoff	declared_reference_handoff	reference_product_at_declared_handoff	handoff weighing and acceptance records	route, terminal_output_row_id, product_state, gate, lot, net_mass_kg, moisture_basis, acceptance, tare	Use calibrated scales or traceable weighing records; reconcile the actual terminal-operation handoff lot, accepted net mass, product state and moisture; exclude packaging tare and do not sum preceding-stage quantities.	kg	each handoff lot	declared reporting period	declared handoff gate	per declared reference flow	calibration or weighing tickets, acceptance and lot traceability
cp_phase1_environment_coverage	buckwheat_field_production	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_area_to_reference_flow	field flows	crop-cycle amount per hectare / marketable grain yield per hectare × 1,000 kg	flow amount; area; same-cycle grain mass	amount per 1,000 kg grain
calc_nutrient_content	fertilizer and amendment inputs	product mass × declared nutrient fraction; preserve elemental or oxide-equivalent basis	product identity; mass; assay; reporting basis	kg N, kg P2O5, kg K2O by source
calc_managed_soil_n2o	soil N2O	apply selected IPCC tier or regional method to fertilizer N, organic N, returned-residue N, volatilization, and leaching pathways	nitrogen activity; residue fate; soil and climate; factors	kg N2O by pathway	ipcc-2019-managed-soils
calc_ammonia_volatilization	ammonia to air	calculate by nutrient product, application method, timing, and applicable factor	nitrogen product records; application details; factors	kg NH3	emep-eea-2023-guidebook
calc_conditioning_mass_balance	grain conditioning	incoming wet grain = accepted grain + useful screenings + rejects + moisture and other measured losses within uncertainty	masses; moisture; loss records	reconciled outputs per accepted grain	mass-balance-identity
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_emission_activity; 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	Confirm buckwheat rather than wheat, rye, quinoa, or mixed grain; retain cultivar, intended use, state, and hand-off.	crop, lot, and sales records
dq_temporal_alignment	all foreground rows	Use inputs, harvest, yield, emissions, and conditioning records from the same crop cycle; disclose proxy years.	dated field and batch records
dq_mass_and_moisture	grain and straw	Retain scale or yield-monitor calibration and moisture measurements for every basis conversion.	calibration and moisture-test records
dq_completeness	process map and flows	Reconcile every field and conditioning batch and distinguish zero, not applicable, proxy, and missing values.	field roster; batch reconciliation
dq_identity_resolution	parameterized and unmapped flows	Verify each actual exchange against its concrete flow UUID, physical state, property and unit; preserve explicit unresolved identities when confirmation is unavailable.	identity review record

9. Validation Rules

rule_id	Applies to	Rule	source_ids
validation_reference_output	terminal output	Exactly one terminal buckwheat grain output equals 1,000 kg after scaling and declares moisture and quality qualifiers.
validation_process_route	process map	Include field production once; include conditioning only before farm-gate hand-off and avoid double counting embedded energy or rejects.
validation_crop_cycle_reconciliation	field inventory	Area, inputs, harvest outputs, residue fates, and emissions refer to the same crop cycle and fields.
validation_nitrogen_balance	nitrogen inventory	Reconcile nutrient content, returned and removed residue nitrogen, and emission pathways with methods and factors disclosed.	ipcc-2019-managed-soils
validation_conditioning_balance	conditioning	Reconcile incoming wet grain with accepted grain, screenings, rejects, moisture loss, and other measured loss within uncertainty.	mass-balance-identity
validation_flow_identity	every flow	Verify each actual exchange against its concrete flow UUID, physical state, property and unit; preserve explicit unresolved identities when confirmation is unavailable.

10. Published Dataset Profile

Field	Value
dataset_role	foreground buckwheat grain production dataset
downstream_use	secondary_dataset; background_dataset after review and publication
allowed_use	farm-gate LCA of buckwheat grain and downstream systems preserving declared geography, season, moisture, residue, allocation, and conditioning context
excluded_use	certified seed, cover-crop or green-manure service, forage, milling, dehulling, feed manufacture, food processing, or another crop without reviewed proxy decision
required_metadata	geography; cultivar; crop season; harvest year; area; yield; moisture; intended use; tillage; irrigation; residue fate; conditioning; allocation; identity resolution
required_quality_disclosure	foreground coverage; proxy inputs; missing records; range exceedances; emission methods; meter and mass-balance reconciliations
update_trigger	new reviewed buckwheat evidence, material route change, revised emission method, changed concrete flow identity verification

11. Data Sources

Source id	Type	Reference	Used for
cornell-buckwheat-production	extension_guidance	Cornell University Cooperative Extension, buckwheat production and cover-crop guidance	crop route, establishment, harvest, and boundary context
ipcc-2019-managed-soils	method_factor	IPCC, 2019 Refinement to the 2006 IPCC Guidelines, Volume 4, Chapter 11, https://www.ipcc-nggip.iges.or.jp/public/2019rf/pdf/4_Volume4/19R_V4_Ch11_Soils_N2O_CO2.pdf	soil N2O, residue nitrogen, volatilization and leaching pathways, and double-counting controls
emep-eea-2023-guidebook	method_factor	European Environment Agency, EMEP/EEA Air Pollutant Emission Inventory Guidebook 2023	agricultural ammonia method and QA context
iso-14044-2006	standard	ISO 14044:2006, Environmental management — Life cycle assessment — Requirements and guidelines	allocation hierarchy and disclosure
mass-balance-identity	method_factor	Conservation of mass applied to matched grain-conditioning batches	conditioning mass-balance calculation and validation

source_id	type	reference	used_for
declared-handoff-measurement-definition	method_factor	This PCR, Sections 3, 6 and 8: measured net mass at the same state and gate is its own normalization denominator, giving a mass ratio of 1; handoff measurement adds no physical processing.	Same-stage and handoff measurement identities; a definition, not an observed yield, empirical default or external publication.
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