Desempenho de genótipos alagoanos de milho (Zea mays L.) em diferentes densidades de semeaduras

Abstract

The study was conducted in 2011, at the Experimental Sector Plant Breeding of the Centro de Ciências Agrárias, Universidade Federal de Alagoas (SMGP-CECA-UFAL), in order to evaluate the performance of corn Alagoanos genotypes in different plant densities. There were evaluated four corn genotypes, which three was developed by SMGP-CECA-UFAL (VIÇOSENSE, BRANCA and RIO LARGO) and another developed by EMBRAPA (BRS 106), in three seeding rates: 50.000, 62.500 and 83.333 plants.ha-1. It was used a randomized complete block design with three replications. The experimental plots consisted of five rows 5,0m long, and useful area comprised of the three central rows. The variables evaluated were: diameter culm (DC), Height of Entering First Spike (AIPE), plant height (PH), Percentage of prolificacy (PROL), percentage of lodged plants (PPA), Spike Length (EC), stem diameter (DE), Number of rows of grains (NFG), Weight of a hundred grains (PCG), Yield Spikes with Straw (REP) and Grain Yield (GY). There was no significant difference between genotypes for the following variables: DC, PPA, EC, ED, PCG, REP and RG. On the other hand, significant differences between genotypes for the following variables: AIPE, AP, PROL and NFG. The genotypes developed by SMGP-CECA-UFAL: VIÇOSENSE, BRANCA and RIO LARGO showed excellent performance for all variables studied, especially in grain yield, with an average yield of 6.379.00 kg.ha-1. The density of 83.333 plants per hectare promoted a higher yield of grain and straw yield, respectively, 11.853.04 kg.ha-1 and 7.888.96 kg.ha-1.