Nitrogen fertilization management in no-tillage maize with different winter crops

• Autor(a) principal: Coutinho Neto, Andre Mendes [UNESP]
• Data de Publicação: 2013
• Outros Autores: Mendes Coutinho, Edson Luiz [UNESP], Orioli Junior, Valdeci, Cora, Jose Eduardo [UNESP], Baizi e Silva, Alysson Roberto, Scatolin, Marcelo [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://www.seer.ufu.br/index.php/biosciencejournal/article/view/15062; http://hdl.handle.net/11449/112005
• topic: Split application of nitrogen; Preplanting fertilization; Tropical soil; Soybean; Zea mays

The nitrogen (N) utilization by maize grown in a no-tillage system is dependent on the quality of the preceding crop residues, which may promote differences in N fertilization efficiency with respect to time. Thus, the purpose of this study was to evaluate the nutritional state, dry matter production and grain yield of maize grown in a clayey soil (Typic Acrustox) under a no-tillage system. The split-plot experimental design was set up in randomized complete blocks with three replications, in which the main plot was treated with different N application strategies and the split-plots were planted with winter crops (soybean and maize). The fertilizer strategies (rate: 120 kg ha(-1) of N) used were as follows: (0 - 0), (20 - 100), (60 - 60), (120 - 0) and (0 - 120), with the first number corresponding to the rate of N (kg ha(-1)) applied before planting and the second number corresponding to the top dressing rate (V4-5 stage). Nitrogen fertilization raised the N content (in shoots and leaves) and maize yield (in the shoot dry matter and grain). The maize grown after soybean had both greater N concentrations and production (dry matter and grain) relative to the maize grown after maize. Applying 120 kg ha(-1) N did not significantly affect the evaluated variables, regardless of the winter crop.