Híbridos interpopulacionais de milho sob diferentes níveis de nitrogênio no sul do Tocantins

Abstract

Hybrids corn interpopulational under different levels of nitrogen in the south of Tocantins. Corn is currently one of the main cereals grown in the world and is present in all regions of Brazil. Despite the state of Tocantins present territorial favorable conditions for the development of culture, maize has increased in low productivity compared to states with higher levels of production. Indeed, due to factors such as disability technologies directed to the reality of the local farmers and inefficient management adoption in the use of nitrogen fertilizers. In this context, the objective was to evaluate agronomic characteristics of interpopulation hybrid corn (Zea mays L.) under different levels of nitrogen in southern Tocantins. The experiment was conducted in the agricultural area of the experimental station of the UFT-GUAC, on January 21, 2014, using experimental design of randomized blocks with four replications, the plot area, consisting of single row of 3 meters in length spaced at 0.75 meters and sowing density of 50,000 plants ha-1. The productive potential of 5 populations of open-pollinated, 15 interpopulational corn hybrids and five commercial checks were evaluated using five nitrogen levels (0, 40, 80, 120, 160 kg / ha) applied in coverage. After the data is subjected to analysis of variance and mean test Scott Knott (P <0.05), it was observed that the interpopulation hybrids obtained a similar performance to commercial double hybrid used as a witness, showing good performances on reduced nitrogen rates .