Avaliação de genótipos de milho em diferentes densidades populacionais

Abstract

The experiment was conducted in the period April to August 2011, in the experimental area of the Department of Plant Breeding Center of Agrarian Sciences, Federal University of Alagoas (SMGP / ECSC / UFAL), with the aim of evaluating corn genotypes in different densities. We evaluated four genotypes of maize, three-SMGP developed by CECA (VIÇOSENSE, BRANCA E RIO LARGO) and a variety developed by EMBRAPA (BR 106) in three population densities (50,000, 62,500 and 83,333 plants.ha-1). We used a randomized block design with three replications in a factorial design (4x3). The experimental unit consisted of five rows 5.0 m in length, with floor area of the three central rows. The variables measured were: Culm diameter (DC), plant height (PH), Insertion Height of First Spike (IEPA), Percentage of prolificacy (PRO), percent of lodging (PPA), Spike Length (EC), cob diameter (DE), Number of Rows of grains (NFG), weight Hundred Grains (PCG) and grain yield (GY). Genotypes developed by SMGP-ECSC showed excellent performance for most variables, especially in grain yield, with an average yield of 6.559,18 kg.ha-1, exceeding the average of 10.29 times Alagoas and 1,31 times the national average. The population density of 83,333 plants.ha-1 produced a higher yield, with an average of 8.109,22 kg.ha-1. There was a significant interaction G x DP only for variable height plants, indicating that the performance of genotypes for the majority of variables was not affected by population density.