Componentes de produção do milho e resistência à penetraçao em função do sistema de manejo e da velocidade de semeadura

Abstract

Tillage systems modify the soil structure and may favor the development of plants. The objective of this study was to evaluate the maize and soil agronomic attributes under different soil management system and sowing speeds in Oxisol. The experiment was developed at the UFGD Experimental Farm and designed in randomized blocks in a split plot scheme with four reps. Six cropping systems were allocated in the plots (plowing + 2 disking, disking, without tilling, chisilied, crossed chisilied and chiseling + disking) and later, during the sowing of maize with four sowing speeds in the subplots. Soil mechanical resistance to penetration, plant emergency, plant stand, longitudinal distribution of seedlings, stem diameter, plant height, first spike insertion height and yield were evaluated. Data were analyzed by variance analysis and Tukey test at 5% probability when significant for mean comparison. The tillage systems affect the penetration resistance (PR) in the surface layers. Greater displacement speeds compact less the soil, effect inguntil 0.3 meters of depth. The tillage systems did not influence the evaluated maize agronomic traits. The higher speed seeding showed an increase in productivity, due to the lower stand of plants. The increasing of maize plant stand affected productivity.