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在我国东南沿海浙江省台州市路桥区马铺农场，进行了连种２０年粮食三熟制（大麦双季稻）的定位研究，结果表明：谷物产量能持续增长，年均亩（６６６．７ｍ２）产可达１０３１ｋｇ。分析持续增产的若干机理，主要为更换作物品种，将常规晚稻换成杂交稻后稻谷产量在１７年内提高３～４成；对农田常年投入足量有机肥可保持土壤肥力的相对稳定，促进土壤有机质积累与更新及氮磷养分的有效化；采用有机肥和化肥配合施用可使谷物氮肥效应明显提高
The research on the location of grain three-cropping system (barley double cropping rice) for 20 years with continuous planting in Mapu Farm, Luqiao District, Taizhou, Zhejiang Province on the southeast coast of China showed that the grain yield could continue to grow with an average annual mu (666.7m2 ) Production up to 1031kg. The analysis of several mechanisms for increasing yields continued, mainly by changing crop varieties, increasing the yield of paddy from conventional late rice to hybrid rice by 3-4% over 17 years, and sufficient organic fertilizer on farmland to maintain relatively stable soil fertility and promote soil fertility Organic matter accumulation and renewal and the efficiency of nitrogen and phosphorus nutrients; the application of organic manure and chemical fertilizer can make grain nitrogen fertilizer effect significantly increased