吉林省梨树县地处松辽平原腹地,地势平坦,土壤肥沃,是我国重要商品粮生产基地之一。多年来,由于传统耕作方式的落后和小功率拖拉机的大量使用,耕作深度只能在8～12cm,土壤耕层逐年变浅,“犁底层”逐渐加厚。据测,现在的“犁底层”厚度已由 Lishu County, Jilin Province is located in the hinterland of the Songliao Plain, flat terrain, fertile soil, is one of China’s major commodity grain production base. Over the years, due to the backward traditional farming methods and the heavy use of low-power tractors, the farming depth can only be 8-12cm, the soil layer becomes lighter year by year, and the thickening of the bottom layer of the plow gradually increases. It is measured that the current “plow floor ” thickness has been