| Two years' field experiments of main multi-cropping systems in alluvial paddyfield of Dongting Lake, which included soybean-rice, soybean intercropping com-rice,rape-rice-rice and green manure-rice-rice, were conducted. The results showed thatcrops yield and economic yield of rape-rice-rice system was highest, and lowest ofsoybean-rice. Comparing the economic benefits of each multi-cropping system, thetotal production value of rape-flee-rice system showed highest, but its net productionvalue was greatly lower than soybean-rice and soybean intercropping corn-flee. Thecoarse protein content of soybean intercropping corn-rice system showed highest,then is soybean-rice, they increased 55.25ï¼…and 50.45ï¼…compared with greenmanure-rice-rice system. Rotation of rice and dry crop in paddy field was in favor ofactivation of soil phosphorus, uptake of phosphorus by soybean-rice system increased18.7ï¼…compared with that by green manure-rice-rice. And natural return of biologicalmatter and nitrogen fixation accounted for 38.57ï¼…of total N input. So, it was anexcellent cropping system for biological fostering land compared with greenmanure-rice-rice.Multi-cropping systems such as soybean-rice and so on, was in favor ofimproving soil physical properties, reproduction of soil mirocrobe, and elevation ofsoil enzyme activity. It consequently resulted in release of plant nutrients, and raisedthe effect of fertilization. Therefore, implement of green manure-rice-rice andvarieties of rotation of rice and dry crop is good for promoting nice recycle offarmland ecosystem, and carrying out steady production and high production, andraising economic benefits. Especially appropriate development of soybeanintercropping corn-rice-winter crop, not only promoted the unite of land using andland fostering, but also could adjust foodstuff structure, and promote the developmentof stockbreeding and food processing industry.
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