Maize nitrogen fertilization in two crop rotation systems under no-till

Revista Ceres

Maria Do Carmo Lana²  Rodrigo Vianei Czycza¹  Jean Sérgio Rosset¹  Jucenei Fernando Frandoloso¹ 

[1] ,Universidade Estadual do Oeste do Paraná Departamento de Agrárias Marechal Cândido Rondon Paraná ,Brazil

关键词: fertilization;    soil management;    Zea mays L.;    yield;    fertilização;    manejo do solo;    Zea mays L.;    produtividade;   

DOI  :  10.1590/S0034-737X2013000600014

来源: SciELO

【 摘 要 】

The objective of this study was to evaluate split nitrogen (N) fertilization of maize applied in band at sowing and top dressing with and without crop rotation, under no-till. The experiment was conducted with six N rates at sowing (0, 20, 30, 40, 50 and 60 kg ha-1) combined with three rates in top dressing (40, 70, 100 kg ha-1) and two management systems: after five cropping sequences of maize and crop rotation (maize + soybean + oat + soybean + corn) in a randomized block design with four replications. The crop rotation system increased yield in approximately 7% in relation to the area without rotation. The split of nitrogen fertilization, in rates above 39 and 54 kg ha-1 at sowing and 70 and 40 kg ha-1 in top dressing, resulted in yield higher than that obtained with the application of 100 kg ha-1 in top dressing. Grain yield was higher with the rates 50 and 70 kg ha-1 of N compared with that obtained with 20 and 100 kg ha-1 at sowing and top dressing, respectively. The rate 70 kg ha-1 of N resulted in the highest yield at the lowest cost compared with the revenues and costs incurred with the rates 40 and 100 kg ha-1.

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