CBAM Fertilisers: documentary evidence and verification readiness

Fertiliser files can involve several production pathways and upstream precursor relationships, including ammonia or hydrogen where relevant. The documentary chain should connect the fertiliser product to the producing installation, process route, period, production quantity, activity data, relevant precursor information and the source records behind the embedded-emissions calculation.

Typical breaks include precursor data from the wrong supplier or reporting period, ammonia or hydrogen values that cannot be connected to the fertiliser batch or production process, inconsistent production quantities, incomplete process-energy data, or calculation versions that changed without a documented replacement trail.

A producer may need to support the installation and production pathway, production quantities, relevant feedstocks and precursor values, fuel or energy data, process emissions, allocation and the calculation version used for the reporting period. Where precursor emissions are imported from an upstream source, the dossier should identify that source and the period to which the value belongs.

The importer needs a defensible connection between the imported fertiliser, the producer and installation, the reporting period, production pathway, relevant precursor information and emissions data supplied upstream. A supplier workbook can be insufficient if the precursor values cannot be traced to the specific production context.

Fertiliser evidence is sensitive to changing feedstocks, precursor datasets, production quantities and period-specific process data. The file should document which version of the monitoring and calculation record governed the reported value and how any later correction affected precursor or activity data.

A verification-ready fertiliser dossier should make the process route, precursor evidence, source data, quantities, calculation and corrections transparent enough for independent scrutiny. Weetra can test that documentary coherence without assuming the verifier’s statutory role.

Weetra checks whether the fertiliser figure can be traced through the installation and production route to quantities, activity data, precursor sources and calculation versions. It records unresolved contradictions and what the documents in scope cannot establish rather than filling gaps with assumptions.

For fertilisers, a durable record should preserve the production pathway, relevant precursor sources, period, quantities and calculation versions so that later reviewers can see which upstream information supported the final value.

The Egypt-to-Spain fertilisers case illustrates how precursor continuity can become a central documentary question. It demonstrates why upstream hydrogen or ammonia information, reporting periods and source records must remain connected to the final fertiliser position.