This experiment was conducted in an Oxisol, in the Experimental Center of Agricultural Engineering, located in Cascavel (PR), Brazil, with the objective of evaluates the physicals attributes and the tractor effort of a planter in four levels of compactation and the influence in the initial population in the cultures of soybean and corn. The experimental outliner scheme was "Split Block", tested with two factors, being two cultures (soy and corn) the first factor and the four levels of compactation the second one, totalizing eight treatments. The four levels of compaction were determined as: T0 - without compaction; T1 - with one pass of the soil compact roll; T3 - with tree, and T5 - with five passes. The parameters evaluated were: the depth of the furrow, average speed, traction force and power force, soil bulk density, soil penetration resistance and the stand of the soybean and corn cultures. The results showed that the applied pressure by the double unbalanced record was not sufficient to maintain the furrow depth in major compactation level.The soil penetration resistance 2.50 and 3.00 MPa and the maximum bulk density 1.39 Mg m-3 did not influence the initial population of the soybean culture, however with the corn culture occurred a reduction in the treatments. When the variation in the depth and the speed of the movement occurred, the strength of traction per line for both cultures studied increased.
bulk density; agricultural machine; traction
