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Soit une rotation Prairie - Maïs - RGI (culture dérobée) - Maïs - Blé. Le second maïs de cette rotation reçoit, en plus de l'engrais starter, un apport d'ammonitrate 33,5. Avant l'implantation du maïs, un apport de fumier de bovins a été réalisé : 45 t à 5 kg N / t ; le coefficient d'équivalence engrais azoté de ce fumier est 0,25.a. Il est plausible que l'apport d'ammonitrate 33,5 soit de 350 kg.b. Il est plausible que l'apport d'ammonitrate 33,5 soit de 7 kg.c. Il est plausible que l'apport d'ammonitrate 33,5 soit de 70 kg.
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