我区有稻田400余万亩,过去大部分是在冬水田里种一季中稻。近年来改冬水田一熟为稻麦或稻油两熟,初期在供肥充足的条件下能获得高产,但连年种植则土壤肥力下降产量不高。为解决这一矛盾,我们于1973—1980年进行了增种短期绿肥和培肥的试验,现将试验的情况简介如下。一、方法与经过 My area has more than 400 acres of paddy fields, in the past mostly in the winter paddy fields planted a quarter of rice. In recent years, a winter paddy field to paddy rice or rice paddy double ripening, early enough to obtain adequate fertilizer to get high yield, but in successive years the soil fertility decline yield is not high. In order to solve this contradiction, we conducted the experiment of adding short-term green manure and manure in 1973-1980. The brief introduction of the experiment is as follows. First, the method and after