Abstract

CERETTA, Carlos Alberto et al. Nitrogen fertilizer split-application for corn in no-till succession to black oats. Sci. agric. (Piracicaba, Braz.) [online]. 2002, vol.59, n.3, pp. 549-554. ISSN 0103-9016.  http://dx.doi.org/10.1590/S0103-90162002000300021.

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 ¾ 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.

Keywords : cultural successions; mineral nitrogen; fertilization.