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近年来各地普遍反映,由于忽视有机肥料的使用,土壤肥力逐年下降,水田土壤尤为突出。在辽宁省关于水田施用有机肥料问题,五十年代曾试图以豌豆为水田绿肥,六十年代又以田菁、油菜为水田绿肥都未获得满意结果。稻草还田也有实际困难。南方几省及我省也曾试用过满江红作为绿肥。但由于气温低、繁殖慢,达不到预想要求。七十年代从国外引进的细绿萍,它具有耐低温、繁殖快等特点,很有希望作为北方水田的绿肥植物。
In recent years, it has been generally reported that due to the neglect of the use of organic fertilizers, soil fertility has been declining year by year, and paddy soil is particularly prominent. In the 1950s, peas was used as green manure in paddy fields in Liaoning Province. In the 1960s, however, green manure was not obtained from the cultivars of Sesbana and rape. Straw also has practical difficulties. Several southern provinces and our province have also tried Azolla as green manure. However, due to low temperatures, slow breeding, fail to meet expectations. Seventy time the introduction of fine green Ping from abroad, it has low temperature, rapid propagation characteristics, there is great hope as the northern paddy green manure plants.