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- W1968775598 abstract "Reduire les ecarts locaux entre rendements reels et potentiels impose d'en diagnostiquer d'abord les causes. Cet article propose une methode pour cela, basee sur une enquete en parcelles de producteurs et sur la construction et l'emploi d'un modele de culture ad hoc. Appliquee au mais des petits producteurs du Bresil central, et avec le modele STICS comme point de depart, cette methode a permis d'identifier les contraintes responsables des ecarts de productivite dans la region, et d'evaluer l'impact specifique de chaque contrainte et des principales interactions entre contraintes sur le rendement. STICS a ete modifie de maniere a ameliorer son module de bilan hydrique pour le contexte tropical et a prendre en compte la toxicite aluminique, l'exces d'eau et la competition entre la culture et les mauvaises herbes pour le rayonnement, l'eau et l'azote. Les principales faiblesses des systemes de culture etaient l'inadaptation des dates de semis, des fertilisations azotees et des calendriers de sarclages, ainsi que des delais entre preparation du sol et semis favorisant la croissance des adventices. (Resume d'auteur)" @default.
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- W1968775598 date "2003-05-01" @default.
- W1968775598 modified "2023-10-16" @default.
- W1968775598 title "Diagnosis of the productivity gap using a crop model. Methodology and case study of small-scale maize production in central Brazil" @default.
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- W1968775598 doi "https://doi.org/10.1051/agro:2003004" @default.
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