Densidades de semeadura de Urochloa ruziziensis em consórcio com milho no médio norte de Mato Grosso

Abstract

The challenge of producing more grains in order to preserve the chemical, physical and biological characteristics of the soil is necessary in modern agriculture. Thus, the objective was to determine the adequate seeding density of Urochloa ruziziensis cv. Kennedy intercropped with the late season maize, which allows to reconcile the productivity of the crop with the production of cover material to the soil, aiming the promotion of the No-tillage System. The experiment was conducted in the Vera city, Mato Grosso, during the agricultural year 2017/18. The experimental design was a randomized block design with four replications and consisted of six sowing densities of ruziziensis grass (0, 3, 6, 9, 12 and 15 kg ha-1 of pure and viable seeds) of corn sowing. Plant population, plant height, stalk diameter, height of insertion of the first spike, spike index, spike length, spike diameter, number of kernels row, mass of hundred grains and grain yield, mass dry matter and foliar nutrient content of the maize crop. Dry matter production of the aerial part of forage were also determined. The different sowing densities of forage influenced the maize in relation to plant height, stalk diameter, hundred grain mass, number of kernels row and grain yield. Leaf nutrient contents did not show differences between treatments. Dry matter production by forage showed the highest dry matter yield at the density of 11.6 kg ha-1.