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研究了稻田养分利用的３种模式，证明在本实验条件下：单施化肥每千克养分增产稻谷６．０９ｋｇ，产投比１．７９：１，且不利于土壤生态的改善；种植冬季绿肥紫云英——早稻草还田，配施适量化肥，每千克养分增产稻谷６．１８ｋｇ，产投比１．８２：１，节约近半数化肥，土壤肥力有所提高，有一定的生态效益；冬季绿肥肥饲兼用——猪粪尿沼气发酵——沼肥还田，节约２／３的化肥，每千克养分增产稻谷６．６１ｋｇ，同时每７４．３千克紫云英鲜草经青贮饲猪，可增猪重１ｋｇ。每千克紫云英干物间接产沼气０．４ｍ￣３，沼肥回收的紫云英氮、磷、钾分别为３２．８％，７２．９％，３９．１％，全程产投比约为４：１，是一个高功能、高效益的养分循环利用模式。
Three patterns of nutrient utilization in paddy fields were studied. It was proved that under the experimental conditions, applying chemical fertilizer per kilogram of nutrients alone increased 6.09 kg of rice and the ratio of production to production was 1.79: 1, which was unfavorable to the improvement of soil ecology. Yunying - early straw to the field, with appropriate amount of fertilizer, yield of 6.18kg per kilogram of nutrients, production and investment ratio of 1.82: 1, saving nearly half of the number of fertilizers, soil fertility has increased, a certain ecological benefits; winter Green manure and feed - Pig manure biogas fermentation - Biogas back to the field, saving 2/3 of fertilizer, yield nutrients per kg of 6.61kg of rice, while every 74.3 kg of milk vetch freshlings of milk vetch, Can increase pig weight 1kg. Per kilogram of milk vetch indirectly produce biogas 0.4m ~ 3, biogas recovery of vanadium nitrogen, phosphorus and potassium were 32.8%, 72.9%, 39.1%, the entire production ratio is about 4: 1, is a high-performance, cost-effective nutrient recycling model.