Pressure and angle of the seed-fertilizer drill press wheel on corn emergence

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.

Design and experiment of the pneumatic pressure control device for no-till planter

“…where, p 0 is the internal pressure of the air spring at a certain time, MPa; V, V 0 is the internal volume of the air spring at the initial state and a certain time, m 3 ; Δx is the surface relief height, m; λ is a variable index, when the air spring runs at a low frequency lower than 0.1 Hz, λ=1, and when the high frequency is higher than 30 Hz, λ=1.4. In practice, according to the working conditions of the repressing wheel, λ=1.33 [19] . Substituted Equation ( 5) into Equation ( 3), the output force in the vertical direction of the air spring was obtained as…”