Measurement of nitrogen mineralization and immobilization fluxes in soil as a means of predicting net mineralization
Résumé
The usual methods proposed to predict net mineral N available to crops, i.e., chemical and biological methods and long-term incubations, are analysed. The failure in the extrapolation of laboratory data and models to predict true N fluxes in situ, mainly results from gross mineralization and immobilization. The processes determining gross fluxes are discussed. Many methodological and theoretical problems are posed by the measurements of true N fluxes under field conditions. First estimations of these fluxes in different crop systems show that the net mineralization rate results from high rate of gross mineralization and immobilization.
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