Details of the methodology for calculating emissions from the agricultural sector within the UK’s Inventory of Greenhouse Gasses have been published in the UK’s national inventory report, which is publicly available via the United Nation Framework Convention on Climate Change (UNFCCC) website.
The inventory’s estimate of emissions from fodder and grassland production is calculated based on statistical data detailing: the area of crop and grassland production from the June Survey of Agriculture and Horticulture; typical UK fertilisation rates for those crops from the British Survey of Fertiliser Practice; and standardised greenhouse gas emissions factors based on UK-specific measurements.
The methodology is based upon a long term research programme supported by Defra under the UK GHG Research and Development Platform. The platform brought together over 100 scientists from 16 research institutes, and engaged industry experts to ensure the inventory was fit for purpose, and accurately reflected UK farming practices. The programme included projects to undertake detailed measurements of methane and nitrous oxide from typical UK farming systems. Reports for these projects are available online via Defra’s R&D portal.
A third project integrated existing data sources with the new data collected via the platform and developed modelling tools to support the national inventory. The final report for this project is undergoing quality assurance and will be published by the end of this year.