Scope 3 Emissions Estimator
for Agriculture

Scope 3 emissions estimation for Agriculture

Agriculture presents a Scope 3 profile shaped by biological processes and land-use dynamics that do not fit neatly into the GHG Protocol's category structure. For arable farming operations, Category 1 (purchased goods and services) is dominated by synthetic fertilisers. The production of ammonium nitrate fertiliser generates approximately 6.7 kg CO2e per kg of nitrogen content through the Haber-Bosch process, making fertiliser procurement one of the most carbon-intensive purchased inputs in any sector. For livestock operations, purchased animal feed (also Category 1) carries embodied emissions from feed crop cultivation, including land-use change emissions where soy or palm-derived feed ingredients are sourced from recently deforested land. The EU Deforestation Regulation (EUDR), which applies from December 2025, adds a traceability requirement that intersects directly with Scope 3 data collection for feed supply chains.

The technical challenge for agriculture is the interaction between Scope 1 biogenic emissions and Scope 3 upstream emissions. A dairy farm's Scope 1 includes enteric methane from cattle and nitrous oxide from manure management and soil application. Its Scope 3 Category 1 includes the embodied carbon in purchased feed, fertiliser, veterinary products, and fuel. Category 3 (fuel and energy related activities) covers upstream emissions from diesel and electricity used in farm operations. Category 4 (upstream transport) captures the delivery of inputs to the farm gate. Category 9 (downstream transport) and Category 10 (processing of sold products) cover the journey from farm gate to processor (abattoir, dairy, grain mill). For vertically integrated agribusinesses that own processing facilities, some of these downstream emissions shift to Scope 1 and Scope 2. Category 11 (use of sold products) is unusual for agriculture: for food products, use-phase emissions are typically the energy used by consumers to cook or refrigerate the product. For biofuel crops, Category 11 captures the combustion emissions when the biofuel is burned by the end user.

Assurance findings in agricultural Scope 3 reporting cluster around fertiliser and feed calculations. Entities that report fertiliser spend without converting to physical quantities (tonnes of nitrogen, phosphorus, potassium) cannot apply the correct emission factors, because a tonne of urea has a different emission factor per kg N than a tonne of ammonium nitrate. Feed-related emissions require knowing the feed composition (percentage soy, maize, wheat, by-products) and the origin of each ingredient, which many farms do not track at this level of detail. Land-use change emissions associated with imported soy are particularly contentious: the emission factor for Brazilian soy from recently converted cerrado land is approximately 8 kg CO2e per kg, compared to approximately 0.4 kg CO2e per kg for European-grown soy with no land-use change. Using a generic "soy" emission factor without specifying origin introduces material error.

For agricultural entities using this estimator, start with your input purchase records. Convert fertiliser purchases from spend to physical quantities (kg of N, P, K applied) and apply production emission factors from sources such as Fertilizers Europe's carbon footprint data or DEFRA. For animal feed, obtain the feed formulation from your feed supplier (or formulate it yourself if you mix on-farm) and apply emission factors per ingredient, using the GFLI (Global Feed LCA Institute) database for feed ingredient lifecycle data. For downstream emissions, estimate distances from farm to first point of sale or processing and apply DEFRA or GLEC transport emission factors by mode. For Category 10 (processing), use published energy intensity data for the relevant processing type (dairy processing at approximately 0.3 to 0.5 kWh per litre of milk processed, grain milling at approximately 50 to 80 kWh per tonne).