Changes in soil density under influence of tractor wheel pressures.

Changes in soil density under in uence of tractor wheel pressures. The results of investigations on the effect of passages of two agricultural tractors MF255 and Ursus 1234 on changes in soil bulk density under the wheel track are analyzed in the paper. The carried out measurements showed that in spite of substantially higher tractor weight and the resulted axle loads, the compaction of particular soil pro le layers under the wheels of tractor U1234 were lower than the soil compaction after passages of tractor MF255. The soil density found after passages of tractor MF255 was higher than the respective value for tractor U1234 by about 1 to 6%.