Abstract
ABSTRACT In precision seed-fertilizer drills, the soil compaction mechanism is responsible for closing the furrow, pressing the soil over the seed. Among the available models, the most used is the V-type wheel system, with several options to regulate the wheel opening angle and pressure exerted on the soil. This study was carried out in the experimental area of the Federal University of Fronteira Sul - Campus Cerro Largo, in an clayey Red Latosol. Parameters related to corn emergence and the seedbed characteristics were evaluated at different regulations of opening angle and pressure of the compaction mechanism. The results indicate that mechanism regulations had no influence on emergence speed, emergence speed index and population of corn plants, under the studied conditions. However, the treatment with highest load and parallel alignment of the wheels caused lower values of elevated area and swelling. Treatments with 15° opening angle caused accumulation of soil in the center of the row, affecting the elevation height.
Highlights
Costs associated with soil tillage operations and the importance of conservation systems have caused farmers to adopt the direct seeding system, in areas with risk of erosion (Conceição et al, 2016)
The seed-fertilizer drill is responsible for opening the furrow, metering and depositing fertilizers and seeds, and closing the furrow
Press wheels perform the function of pressing the soil laterally to the seeds, causing the layer in the center of the row to be less dense, reducing the effort needed for epicotyl emergence
Summary
Costs associated with soil tillage operations and the importance of conservation systems have caused farmers to adopt the direct seeding system, in areas with risk of erosion (Conceição et al, 2016). In this cultivation system, the seed-fertilizer drill is responsible for opening the furrow, metering and depositing fertilizers and seeds, and closing the furrow. Most seeders are equipped with V-type furrow-closing mechanisms, with regulations of opening angle and compaction pressure in most press wheels
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