Evaluation of corn genotypes, with or without nitrogen topdressing, in distinct conditions of seeding

Abstract

The aim of this study was to evaluate the yield of green weight and grain yield of corn genotypes, with or without nitrogen topdressing in distinct conditions of seeding, at Gurupi and Palmas in Tocantins. Experiments were conducted with distinct conditions of seeding, and the experimental design, in each one, was randomized block (16 genotypes x 2 levels of topdressing of nitrogen), with two replications. Yield of green weight was evaluated at stage R5 and the grain yield after stage R6. The analysis of variance (16 x 2) was done for each experiment. Significant differences were observed among the genotypes in: two experiments for yield of green weight and four experiments for grain yield. The significant effect of nitrogen topdressing was observed in: two experiments for yield of green weight and; three for grain yield. For the distinction of genotypes and the visualization of significant effect of nitrogen fertilization in topdressing the grain yield was more adequate than the yield of green weight.