Sustainable agriculture is all about conserving soil organic matter. Soil-borne crop residues need to be sufficiently rich in nitrogen to be properly humified into stable SOM. Polyor SAS has been developing and simple algorithm - AgroNum - that ensures that cereal crop-residues across all of Europe contain sufficient nitrogen to that effect. For those interested ; www.polyor.fr was recently updated - https://lnkd.in/eK2mhszv.
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