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Pour la conduite technique d'un maïs, un exploitant épand 45 kg / ha d'un engrais "starter" 18-46. Quelle est la dose d'azote apporté (en kg N / ha) ?a. 8,1b. 20,7c. 81d. 207e. 102f. 250g. 40h. 98i. Il n'est pas possible de répondre à cette question sans connaître la quantité de nitrates et d'ammonium dans cet engrais.
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