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SIMBA-N: Modeling nitrogen dynamics in banana populations in wet tropical climate. Application to fertilization management in the Caribbean

Dorel M., Achard R., Tixier P.. 2008. European Journal of Agronomy, 29 (1) : p. 38-45.

DOI: 10.1016/j.eja.2008.02.004

In banana plantations of the Caribbean, nitrogen (N) fertilization widely exceeds nutrient outputs after harvest. Underwet tropical climate, leaching results in considerablewaste of N. Fertilization management aims at maintaining soil mineralNat the optimal level for banana nutrition throughout the year but it does not take into account variations in crop N demand or N supply through mineralization of crop residues. The dynamics of crop N demand and crop residue supply depend on the structure of banana populations, which become asynchronous with time. We designed the SIMBA-N model to simulate N dynamics in successive crop cycles of banana. The model calculates the N balance weekly, including N uptake by banana, N leaching, and N supply by organic matter mineralization. We validated the model using data from a field experiment comparing five levels of fertilization. Results showed SIMBA-N provides reliable indicators to support banana fertilization management taking into account N flows in the soil and change in N demand related to banana population structure.

Mots-clés : musa (bananes); fertilisation; résidu de récolte; modélisation des cultures; modèle de simulation; azote; sol volcanique; facteur climatique; facteur édaphique; lessivage du sol; guadeloupe; france

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