集约化重型拖拉机的使用有利于发展农业生产 ,但由于拖位机轮胎对土壤的冲击 ,对土壤水分、通气性、肥力和植物生物活性条件等的不利影响 ,又反过来影响了作物的产量。推导了轮式拖拉机下土壤的应力公式 ,并进行了履带分散传导挤压实验 ,结果表明 ,拖拉机履带能够降低土内应力及对土壤的压实 ,从而减少了冬春小麦的产量损失 The use of intensive heavy-duty tractors favors the development of agricultural production but adversely affects soil moisture, aeration, fertility and plant biologically active conditions, which in turn, affect crop yields due to the impact of the drag tire on the soil. The formula of soil stress under wheeled tractor is deduced, and the experiment of scattered conduction squeezing of crawler track is carried out. The results show that tractor crawler can reduce soil stress and soil compaction, and reduce the yield loss of winter and spring wheat