Agronomic performance of hybrids and varieties of maize in function of nitrogen in coverage

Abstract

This study aims to compare the agronomic performance and the productivity of the corn hybrid AG 1051 and the Incaper Capixaba 203 variety in function of different nitrogen (N) doses in coverage. The experiment was held at the Federal Institute of Espírito Santo -Campus Santa Teresa. The design was of randomized blocks and the treatments were arranged in a split plot scheme, with four repetitions. The plots were represented by two corn genotypes and the subplots consisted of five N doses coverage: 0, 60, 120, 180 and 240 kg ha -1 N. After flowering, the plant height, stem diameter, the height of ear insert and the number of leaves per plant were evaluated. After harvest, the number of grains per spike, the 1000 grain and grain productivity were evaluated. All N dosages influenced all the features evaluated for both genotypes, which showed an increase with the increasing dose of the nutrient. The differences between the genetic materials to all the analyzed variables, except in grain productivity were found. The N dose estimated provides greater productivity for average grain (8785.98 kg ha -1 ) for both genotypes 207.17 kg ha -1 of N.