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在夏玉米亩产350～400公斤水平下,采用玉米与矮秆作物间作,当玉米密度与单作相同,而占地面积缩少到全田的70%左右,肥料集中施用到玉米种植带时,间作的玉米可比单作玉米增产或显著增产,地力不降低或基本不降低,有利于解决农饲、农菜、禾豆等作物之间争地矛盾,促进农牧结合,提高土地生产力,增进经济效益。在玉米亩产350～500公斤水平下,采用玉米密度不减少的间作大豆方式,其土地当量比、全田产品蛋白质和脂肪含量、纯收益皆高于单作,且于下限产量水平提高的幅度大于上限产量水平,玉米少行比的间作方式优于多行比。从全田絕对产量看,除产量高于450公斤的玉米多行比间作方式外,皆高于单作。为稳定和提高间作方式的上述效益,宜对亩产350～400公斤的间作田增施氮肥,亩产500公斤左右吋增施磷、氮肥。
Under the condition of 350-400 kg per mu of summer maize, corn and dwarf crops were used for intercropping. When the density of corn was the same as that of single crop, the area of land was reduced to about 70% of that of the whole field. When the fertilizers were intensively applied to the corn belt , Intercropping corn can increase yield or increase yield significantly compared with monoculture corn, soil fertility does not decrease or basically does not reduce, which is conducive to solving the contradiction between agriculture, animal husbandry and gramineous crops and other crops, promoting the integration of agriculture and animal husbandry, improving land productivity, enhancing Economic benefits. Under the level of 350 ~ 500 kg of corn per mu, the method of intercropping soybean with no decrease of corn density showed that the land equivalent ratio, the total protein and fat content of the whole field and net income were all higher than those of the single crop, and the increase in the lower yield Greater than the upper limit of output level, intercropping less maize than the multi-line ratio better than. In terms of the absolute yield of the whole field, except for the multi-row intercropping method of corn with a yield higher than 450 kg, it is higher than that of single crop. In order to stabilize and enhance the above-mentioned benefits of the intercropping method, nitrogen fertilizer should be applied to intercrop fields of 350 to 400 kg per mu, and phosphorus and nitrogen fertilizers should be added at about 500 kg per mu.