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连续１０年进行了油菜、黑麦草、紫云英等３类冬作物还田试验。结果表明，３类作物连种１０年，土壤有机质增加。其中，油稻增加最多，达３．１９ｇ／ｋｇ，平均每年增加０．３２ｇ／ｋｇ；结合态腐殖质以松结态增加最多；０．２５～０．０５ｍｍ微团聚体数量增加最多。土壤全氮量以饲－稻处理增加最多，达０．４３ｇ／ｋｇ，并以重组有机质氮含量最高；土壤有机磷和速效磷含量以麦稻稻增加较多，有机磷提高２１．７ｍｇ／ｋｇ。但３类作物对土壤物理性质改善差异不明显，水稻产量以饲－稻最高。
For 10 consecutive years rape, ryegrass, asparagus and other three types of winter crops to field test. The results showed that the three kinds of crops were planted for 10 years, soil organic matter increased. Among them, the rice increased most, up to 3.19g / kg, with an average increase of 0.32g / kg per year; the bound humus increased most in the loosely knotted state; the number of microaggregates increased most from 0.25 to 0.05mm. Soil total nitrogen increased most by fodder-rice treatment, reaching 0.43g / kg, with the highest content of nitrogen in recombinant organic matter. The content of soil organic phosphorus and available phosphorus increased more in wheat and organic phosphorus increased by 21.7mg / kg . However, the difference of soil physical properties between the three crops was not obvious, and the yield of rice was the highest in feed-rice.