Produtividade de milho em sistema de plantio direto: influência de sulcadores e métodos de manejo de palhada de aveia

Abstract

Straw management strategies combined with the use of furrowersmechanismsunder no-tillage system can influence and enable better yields in corn crop. Thus, the objective of this work was to evaluate the productivity of corn crop in no-tillage system due to the use of sulcing mechanisms and forms of oat straw management. The experiment was conducted in the 2019/2020 crop, in a randomized block design, in a factorial scheme, composed of the combination of two furrowersmechanisms(furrow opener and double disc) and three oat straw management (rolled, desofated and crushed), with four replications. Dry matter of oats, groove depth, groove width, mobilized area, emergence speed index,initial and final stand of plants, initial and final height of plants, initial and final diameter of thatch, ear insertion height, rows per ear, number of grains per row, ear length, ear diameter, mass of a thousand grains and yield. The results were submitted to analysis of variance by the F test at a significance of 5% probability, for the components in which the F test presented significant value, the means were compared by the Tukey test. The dry matter obtained averages between 3,582.75 to 4,960.17 t ha-1. Crop development parameters did not differ for any of the straw management and furrow mechanisms, while the corn yield and productivity components showed differences between furrow mechanisms, with positive highlights for the use of furrow stem with productivity between 8,210.04 a 9,330.10 kg ha-1.