The performance of the planter is directly linked to the mechanisms of contact with the soil, more specifically to the furrow openers mechanism. The aim of this study was to evaluate the responses of the soil, machine, and the corn crop, according to furrow openers hoe type and working depths, in an eutroferric Red Latossol and no-tillage system. Soil disturbance, drawbar power and force, speed of operation and corn grains yield was evaluated. The soil disturbance presented difference for the factors; openers and depths. The distinct behavior of the openers, due to their geometry, was a limiting factor for the working depth that determines the area of disturbed soil. Energy demand to the tractor presented difference for openers and depths. The opener with angle of inclination of 17° and width of 21 mm (Opener 1) caused higher soil disturbance and lower force and power. In a Red Latosol with no-tillage system, the working depth of 90 mm â€‹â€‹required lower draft demand and a soil disturbance suitable to the corn crop development.
Key words: Agricultural mechanization, direct seeding, planter.
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