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Nitrogen fertilizer split-application for corn in no-till succession to black oats

2002; UNIVERSIDADE DE SÃO PAULO; Volume: 59; Issue: 3 Linguagem: Inglês

10.1590/s0103-90162002000300021

1678-992X

Carlos Alberto Ceretta, Claudir José Basso, Jeferson Diekow, Celso Aita, Paulo Sérgio Pavinato, Frederico Costa Beber Vieira, Edson Rodrigo Oliveira Vendrusculo,

Soil Carbon and Nitrogen Dynamics

The studies of fertilization splitting are necessary specially for the grass succession black oat-corn where N immobilization is very common. Four experiments were carried out in commercial farms under no-tillage, in four counties - Itaara, Santo Ângelo, Júlio de Castilhos and Tupanciretã, all of Rio Grande do Sul, Brazil, with the objective of evaluating the splitting of N application in a corn/black oat crop rotation, during the 97/98 and 98/99 cropping seasons. The N was applied at three times -- pre-planted, starter and sidedressed. The pre-planted applied N for corn, corresponding to total or partial rates that would be sidedressed presented similar results in relation to the sidedress application, however, years of above average rainfall presented N deficiency for corn, reducing yield, which indicates that N application as starter or sidedress is recommended.