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在川中丘陵区紫色土坡耕地上进行不同耕作措施的水土流失试验观测表明，雨季红薯套种玉米１０°坡耕地水土流失量大小的次序为：顺坡垄作＞坡面种植＞等高垄作＞横垄加＞横坡梯沟。横垄加档和横坡梯沟是保土增产效果好且简便实用的耕作方法。作物覆盖度与坡耕地水土流失量的相关关系显著，在１０°坡耕地顺坡垄作中，作物覆盖率从１００％减少为０（裸露地）时，每单位降雨侵蚀力所产生的径流量、土壤冲刷量分别增加９倍和２倍。据此，实行间作套种，增种爬地作物，也是减少坡耕地水土流失的有效措施。
The results of soil and water loss experiments on different tillage practices on purple soil slopes in the hilly area of central Sichuan Province showed that the order of soil erosion amount on the 10 ° sloping fields of sweet potato intercropping corn in the rainy season was as follows: slope planting> slope planting> contour ridge> Plus> horizontal slope ladder. Transverse ridges plus files and cross-slope ladder ditch is a good yield-increasing and simple and practical farming methods. The correlation between crop coverage and the amount of soil and water loss on sloping farmland is significant. When the crop coverage is reduced from 100% to 0 (bare ground) in 10 ° sloping slope farmland, the runoff per unit rainfall eroquence, Soil erosion increased 9 times and 2 times respectively. Accordingly, the intercropping intercropping and increasing the crops for climbing are also effective measures to reduce soil and water loss on sloping farmland.