ABSTRACT
The chisel plow is an important implement for tillage, but it is not always used correctly in the "Cerrados", due to limited availability of knowledge on the behavior of the chisel plow in these soils. An experiment was set up at the "Escola Agrotécnica Federal de Cuiabá" with the objective of evaluating the action of a chisel plow, with a parabolic stem, in "Cerrado" soil. The plots were set on a "Latossolo Vermelho-Amarelo", with 14.3% clay, under a mulch blanketing of 9.975 kg ha-1 (DM) and 13% soil moisture. The results show that the mobilized area and the specific resistance were not influenced by speed variation. The power increased and the energy consumption (kWh ha-1) decreased with the increase of the speed. The pull traction, power and the soil specific resistance varied quadratically with tillage depth, while the cross section at area of mobilized soil presented a linear behavior. The best efficiency of 85.69%, was obtained for the relation width/depth = 1.23. The equation of McKeys, with a correction factor of 1.08, was efficient for the prediction of the effectively mobilized area.
Key words:
pull traction; power; mobilized area; efficiency