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在四川紫色丘陵灰棕紫泥水稻土上,用田间试验和大面积示范相结合的方法,研究了蚕豆青(或青草)、细绿萍和猪粪等有机肥与化肥的不同配合对提高地力和增产节肥的效果,结果表明有机无机配施,水稻、油菜产量均高于或接近全施化肥,每亩节约化学氮(按纯氮计,下同)2～3公斤,其经济效益随着化肥比例的增加而降低。在上千亩面积上示范试验结果,有机无机配施的一般比只施化学氮肥的水稻平均增产32～51公斤/亩,节约化学氮2.1～3.9公斤/亩,取得较好的增产节肥效果。
In purple purple hilly purple-brown purple paddy soil in Sichuan Province, field trials and large-scale demonstration of a combination of methods to study the broad bean green (or grass), fine green duckweed and pig manure and other organic manure and chemical fertilizer to improve the ground force The results showed that the yield of organic and inorganic fertilizer, rice and rapeseed were both higher than or close to that of all chemical fertilizers, and the economic benefit of chemical nitrogen per acre (calculated as pure nitrogen, the same below) was 2 ~ 3 kg The proportion of fertilizers and reduce. In the demonstration area of thousands of acres of test results, the organic and inorganic than the general application of chemical nitrogen fertilizer only an average yield of 32 to 51 kg / acre, save chemical nitrogen 2.1 ~ 3.9 kg / acre, and achieved better production of fertilizer .