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在美国密西西比州北部实施水土保持研究计划（CRP）的流域中，为了确定耕作措施对土壤潜在侵蚀和土壤质量的影响，采用人工模拟降雨试验进行测试。统计证明，未被干扰破坏的CRP流域土壤流失量是最小的，而已耕作了9个月的CRP流域土壤流失量与耕作了几年的CRP流域土壤流失量几乎是相等的。耕作和冬季的休闲，会引起生物营养物质的分解而导致土壤质量的退化。因此，CRP流域一经被耕作和作物非生长季节的休闲，则CRP的水土保持效益和土壤质量就会很快降低。
In a watershed where the Soil Conservation Research Program (CRP) was implemented in the northern Mississippi, USA, artificial simulated rainfall tests were conducted to determine the effects of tillage practices on soil potential erosion and soil quality. Statistics show that soil loss in CRP watersheds that have not been disturbed is the smallest, while soil loss in CRP watersheds that have been cultivated for 9 months is almost equal to that in CRP watersheds that have been cultivated for several years. Tillage and winter recreation can lead to the decomposition of biological nutrients leading to the degradation of soil quality. Therefore, once the CRP basin has been tillaged and the crop is not growing seasonally, the benefits of soil and water conservation and soil quality of the CRP will decrease rapidly.