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水生绿肥——细绿萍,由于耐寒、高产等优点,已在全国各地推广。我县从1979年引种以来,其增产改土效益已在实践中初露头角。从经济效益和绿肥的合理搭套来看,细绿萍都是很有希望的绿肥品种。为了探讨其增产改土效应,1981年,笔者在三个公社、三种土壤和四种水稻类型上进行了有关肥效试验,同时在马埠公社建立了110亩的大田萍肥示范片。这些试验示范的结果一致证明,细绿萍有一定增产效应,亩用量在3,000～12,000斤范围,增产率为6.64～41.73％。从总的趋势看,其肥效高于牛栏粪而略低于红花草,但经济效益却显著超过红花草。
Aquatic green manure - fine green Ping, due to cold, high yield, etc., has been in all parts of the country to promote. Since the introduction of our county in 1979, the benefit of increasing production and improving soil has become an issue in practice. From the economic benefits and green manure reasonable set of view, fine green Ping are promising green manure varieties. In order to investigate the effect of increasing yield and improving soil quality, in 1981, the author conducted fertilizer efficiency tests on three communes, three soils and four types of rice. At the same time, 110 mu of Dafeng Pingfei demonstration film was set up in the Mabu Commune. The results of these pilot demonstrations consistently show that fine green Ping has a yield-increasing effect, the amount of acres in the range of 3,000 to 12,000 kg, the yield was 6.64 to 41.73%. From the general trend of view, its fertilizer efficiency is higher than the bullpen dung and slightly lower than the red flowers, but the economic benefits have significantly exceeded the red flowers.