Nitrogen fertilization recommendation for corn cultivated under no-tillage
REVISTA BRASILEIRA DE ENGENHARIA AGRICOLA E AMBIENTAL(2020)
摘要
The amount of nitrogen (N) suggested for corn crop must meet its demand, maximizing yield and minimizing losses. Therefore, the objective of this study was to determine the recommendation of N fertilization for corn grown under no-tillage, using the method that considers the availability of N from the soil, the N requirement for the crop to reach the projected yield and the N-fertilizer recovery efficiency. The experiment consisted of four doses of N (0, 30, 70 and 95 kg ha(-1)), arranged in randomized blocks, with five repetitions. N stock of 4,357.90 kg ha(-1) in the 0-20 cm soil layer provides corn plants with 52.83 kg of N ha(-1), corresponding to a mineralization coefficient of 1.2%. The N-fertilizer recovery efficiency and the harvest index show a progressive linear increase according to N doses. In projections of yields lower than 1,000 kg ha(-1), N fertilization is not necessary; however, in corn cultivation under no-tillage aiming at yield above 5,000 kg ha(-1), fertilization needs to be performed with doses above 100 kg of N ha(-1).
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关键词
Zea mays,recovery efficiency,N stock,soil fertility
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