Analysis on Economic Benefit of Paddy Field Typical Cropping Patterns in Hunan Province

The study compared and evaluated four typical rice cropping patterns which were rape-rice-rice triple cropping,winter fallow-rice-rice double cropping,rape-late rice double cropping and winter fallow-medium rice by utilizing the view of value stream in agricultural ecology.The results showed that rape-rice-rice triple cropping was the best one.Meanwhile,the cost-effectiveness change of four patternswas analyzed in several aspects,such as net output,production cost and material cost.The changes and the reasons were illustrated on the cost of production and material of rape-rice-rice triple cropping.