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用小四轮拖拉机、铁牛６５０和ＪＬ１０６５联合收割机在松软的种床上压地一遍，测定不同深度土壤体积密度的变化。结果表明：小拖碾压仅对表层土壤体积密度有一定的影响；大拖拉机和联合收割机对土壤体积密度的影响深度超过了４０ｃｍ。由于土壤体积密度的增加，导致耕作阻力及作业能量的增加，与未经碾压的种床相比，大拖拉机和联合收割机引起的压实，可使耕作阻力增加２５％，相应的能量消耗增加２００％。
With a small four-wheel tractor, the Triton 650 and the JL1065 combine harden on soft seed beds to measure changes in soil bulk density at different depths. The results showed that the rolling mowing only had a certain influence on the bulk density of topsoil; the effect of big tractor and combine harvester on soil bulk density was more than 40cm. As soil bulk density increases, resulting in tillage resistance and increased work energy, compaction resulting from large tractors and combine harvesters can increase tilling resistance by 25% compared to unrolled seed beds, with corresponding energy expenditure Increase by 200%.