Qualidade de semeadura e produtividade do milho sob palhada de aveia preta dessecada em diferentes épocas e mecanismos sulcadores

Abstract

The aim of this study was to evaluate the quality of sowing maize crop, when submitted to different black oats desiccation time and furrowing mechanisms. The experiment was conducted in the experimental area of Federal University of Technology - Paraná, campus Pato Branco in a Rhodic Hapludox soil. The treatments were composed of four times of black oats desiccation (0, 15, 30 and 45) days before sowing, and two furrowing mechanisms (double disk and furrowing rod) of a no-till seeder. Some evaluations as of oat dry mass, furrow depth, furrow width, mobilized soil area, seed deposition depth, seedling emergence speed index, emergency gait, initial plant stand, final plant stand and productivity were made. The desiccations 0 and 15 days before sowing had the highest content of dry matter. The stem-type trencher acts at a greater furrow depth in the deposition of seeds and fertilizers, causing greater lateral mobilization of soil and consequently greater soil rotation. The content of dry matter present in the soil influences directly the IVE due to the formation of a physical barrier in the soil. The stem-type furrower presented both larger initial and final plant stand, however, the productivity did not present a significant difference for the treatments.