试验证明:在土壤含水量很低时,镇压表土是减少水分损失的一种方法。这样,位于中层和下层的土壤不受干燥的大气影响。克拉斯诺达尔农业研究所农业讲座工作人员所进行的研究证明了:当土壤含水量到19%为止,镇压均能保蓄水分,相反地,当土壤含水量在23%以上,镇压会增加水分的损失。含水量高的土壤,压紧其表层会使水分上升而蒸 Experiments show that when the soil moisture content is very low, suppression of topsoil is a way to reduce water loss. In this way, soils located in the middle and lower layers are unaffected by the dry atmosphere. Research conducted by agricultural lecturers at the Krasnodar Institute of Agricultural Research proves that repression retains moisture when the soil moisture content reaches 19%, whereas repression increases when the soil moisture content is above 23% Water loss. Soil with high water content, pressing its surface will make the water rise and steaming