Abstract:

Abstract In order to study the potential yield of multiple cropping system about red soil rice field in Southern Hunan, continuously improve the economic benefit and soil fertility, promote agricultural sustainable development, provide scientific basis for production demonstrate and leadship decision-making. In order to study the effect of rice-rice-milk vetch rotation system, a long-term test had been arranging since 1982 in Red Soil Station of CAAS, which located in Guanshanping Qiyang Hunan. Four treatment was arranged in the test, that is rice-rice-milk vetch rotation(leguminosae), rice-rice-oilseed rape(cruciferae), rice-rice-rye grass(gramineae) and rice-rice- winter fallow. The results are as follows: 1) Compared with winter fallow treatments, rice yield was increased under rice-rice-milk vetch rotation treatment; 2) The density of weed species diversity was reduced obviously, the species was reduced on early rice, but not affected obviously on late rice; 3) rice-rice-milk vetch rotation system is a worthy of popularizing planting mode.