The mineralization of soil organic matter, apart from any input, constitutes a very significant nitrogen input. The quantities of nitrogen released by the soil for cultivation depend :
The predicted nitrogen balance consists in predicting the exact dose of nitrogen to be added to the crop in order to avoid :
The challenge is to develop techniques to better understand the composition of an organic fertilizer (solid manure, slurry manure, poultry manure ...) on one hand, and better understand the mechanisms of mineralization and volatilization of nitrogen that it contains. This information, which is decisive for the quantity of nitrogen actually available, should make it possible to adjust with a maximum of precision the organic contribution to the real needs of the plant.