How to comply for this code
Methodology guide -- fertilisers
The fertiliser sector is dominated by ammonia synthesis. Roughly 80% of the embedded emissions in a NPK or urea import trace back to the ammonia feed.
Step 1: identify the ammonia source. Natural-gas-based ammonia (most of Europe, Middle East, Trinidad) emits about 1.6-2.1 t CO2/t NH3. Coal-based ammonia (parts of China, India) emits 3-4 t CO2/t NH3. Renewable / "green" ammonia is approaching zero direct emissions.
Step 2: account for downstream urea / ammonium nitrate steps. Urea synthesis re-fixes some CO2 from the ammonia step (about 0.73 t CO2 per tonne of urea), reducing net emissions. The full calculator handles this; the preview does not.
Step 3: collect verified data. Reg. 2025/2621 requires direct emissions (process + fuel) per tonne of finished fertiliser, plus the ammonia source and any N2O abatement (catalysts in nitric acid plants reduce N2O 10-fold).
Step 4: watch out for blended NPKs. A 20-10-10 NPK is 80% N -> roughly 80% of the CBAM cost falls on the nitrogen fraction. Single-nutrient comparisons are misleading.