Do we have to use kg N or kg organic fertilizer multiply by emission factor of organic fertilizer production?
Organic fertilizers are made from natural materials and are generally considered to have a lower carbon footprint than mineral fertilizers. To calculate the exact carbon footprint, the origin and production methods of each raw material should be known. Organic fertilizers can vary depending on their production method, transportation distance and the type of organic materials used. Also, animal manure and meals are known to have a higher carbon footprint compared to vegetal raw materials due to the release of greenhouse gases such as methane and nitrous oxide, which are more potent than carbon dioxide. Manure compost accounted for 5 % of the total CO2 emissions, while residual roots and root exudates contributed 2 % and 57 %, respectively, suggesting a higher labile carbon content in root exudates. The remaining 36 % of CO2 emissions was derived from the soil and other sources. CO2 emission factors are 6 % for manure compost, 12 % for roots, and 2 % for root exudates. By quantifying the direct emissions from manure compost, residual roots, root exudates, and soil, The calculated carbon footprints were 0.8 kgCO2,eq./kg for N
https://www.sciencedirect.com/science/article/abs/pii/S0048969723062307
https://www.e3s-conferences.org/articles/e3sconf/pdf/2018/48/e3sconf_icenis18_08005.pdf
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