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在沿江砂壤土上进行了长达１２ａ的稻麦复种连作长期少免耕定位试验．结果表明：少耕的稻、麦产量与常耕基本持平，免耕小麦稳定增产，平均增产５．３％，免耕水稻平均减产２．２％，长期少免耕产量没有明显的时间趋势变化．在经历约５ａ的少免耕后，土壤有机质基本处于稳定状态，全耕层有机质含量耕法间无明显差异，但在层次分布上有所不同，少、免耕表现出表层富集，富集系数后７ａ平均分别为１．１１４０和１．１６０８．不同耕法间０～７、１４～２１ｃｍ土层容重差异不明显，７～１４ｃｍ土层常、少、免耕分别为１．３４８、１．４１２、１．４１０ｇｃｍ－３，少、免耕显著高于常耕
Long-term and no-till trials were carried out on the sandy loam along the river for up to 12 years. The results showed that the yield of reduced tillage rice and wheat was basically the same as that of conventional tillage, the stable yield of no-tillage wheat increased by 5.3% on average, and the average reduction of no-tillage rice was 2.2%. There was no obvious time trend . After about 5 years of no-tillage, the soil organic matter was basically in a stable state. There was no significant difference in total organic matter content in tillage between tillage methods, but it was different in the distribution of tillage and no tillage showed surface enrichment and enrichment The average of 7a after the coefficient was 1.1140 and 1.1608 respectively. There was no significant difference in the bulk density of 0 ~ 7,14 ~ 21cm soil layer between different tillage cultivars. The soil bulk density of 7 ~ 14cm soil layer was less, no tillage was 1.348, 1.412 and 1.410gcm-3 respectively, Higher than constant farming