Value flow Analysis on the Agricultural Models of Straw Returning in the Center Shaanxi Plain

The value flow is one of important characteristics of the agricultural eco-economic system,and evaluation on the economic benefit of straw-return agricultural production mode through the value flow characteristics is of great significance.A located experiments based on the straw-return agricultural production mode is conducted to explore the value flow characteristics in wheat-corn rotation system under different straw-return modes.Results show that,the mode of the high stubble mulch of wheat and corn straw chopping had the best economic benefit,and its profit,cost-output ratio,cost net yield,cost utilization,labor productivity and labor net productivity all are the highest of 19 811.91 yuan.hm-2,2.47,1.55,1.47,31.64 and 19.81 respectively;The mode of no wheat straw-return has no corn straw-return has.the lowest values of 16 072.39 yuan.hm-2,2.06,1.22,1.06,13.51 and 7.97 respectively.The mode of no wheat straw-return and corn straw chopping has the highest gross product and net product of 33 723.84 yuan.hm-2 and 21 737.84 yuan.hm-2 respectively,while the mode of the high stubble mulch of wheat and corn straw chopping has the lowest gross product and net product of 30 500.03 yuan.hm-2 and 18 053.03 yuan.hm-2 respectively.The comprehensive evaluation score is biggest in the model of the high stubble mulch of wheat and corn straw chopping and the smallest in the model of no wheat straw-return and no corn straw-return,and score in two models are 0.982 and 0.740 respectively.Therefore,the mode of the high stubble mulch of wheat and corn straw chopping is the optimal model in planting production in this area and should be widely popularized.