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总结了１９９１年～１９９５年关于双季稻吨粮田的土壤肥力定位研究情况。试验表明，在实施吨粮技术体系的条件下，产量和土壤肥力是稳定的。在不同冬作类型中，紫云英对提高土壤有机质和全氮量，活化土壤磷素有着明显作用
The research status of soil fertility in double cropping paddy field from 1991 to 1995 was summarized. Tests showed that yield and soil fertility were stable under the T & T technical system. In different winter-type, Astragalus sinicus played a significant role in increasing soil organic matter and total nitrogen, and activating soil phosphorus