A Comparative Study On The Energy Flow Of The Cooperative Circular Agriculture Model

This study adopted on-the-spot investigation with the experiment,.and collected all the production and management data of Donglin cooperation farm in Donglin Village, Chengxiang Town,Taicang City, South Jiangsu during 2013-2014. And all the data were analyzed by converting into the corresponding energy flow, material flow and value stream. This paper focused on analyzing the energy flow of four production models that are straw un-returning system, straw all returning system, planting combining with the same amount of organic fertilizer system and planting combining with the over amount of organic fertilizer system, and it demonstrated the relationship of four models material flow and value stream, and in order to provide data and a reference for planting cycle agriculture in plain area of South Jiangsu. The results were summarized as follows:(1) (Model 1) straw un-returning system’s energy input level was 6051.99MJ/ha which can be accounted for organic energy 5.196% and inorganic energy 94.804% and energy output level is 24378.74MJ/ha which can be accounted for economic output 52.113%. The output and input ratio was 4.028. The cyclical index was 0.052. The output and input ratios of N, P and K are 0.412,0.581 and 0.852, and the value input and output ratio was 2.33.(2) (Model 2) straw all returning system’s energy input level was 18398.92MJ/ha which can be accounted for organic energy 68.816% and inorganic energy 31.184% and energy output level is 25511.62MJ/ha which can be accounted for economic output 51.883%. The output and input ratio was 1.387. The cyclical index was 0.688. The output and input ratios of N, P and K are 0.385,0.544 and 0.551, and the value input and output ratio was 2.39.(3) (Model 3) planting combining with the same amount of organic fertilizer system’s energy input level was 9277.57MJ/ha which can be accounted for organic energy 38.157% and inorganic energy 61.843% and energy output level was 15160.39MJ/ha which can be accounted for economic output 93.030%. The output and input ratio was 1.634. The cyclical index is 0.382. The output and input ratios of N, P and K are 0.473,0.714 and 0.317, and the value input and output ratio was 2.97.(4) (Model 4) planting combining with the over amount of organic fertilizer system’s energy input level was 14608.13MJ/ha which can be accounted for organic energy 60.724% and inorganic energy 39.276% and energy output level was 16007.58MJ/ha which can be accounted for economic output 100%. The output and input ratio was 1.096. The cyclical index is 0.607. The output and input ratios of N, P and K are 0.462,0.777 and 0.276, and the value input and output ratio was 2.56.To sum up, by comparing the energy flow, material flow and value stream of four models, Model 3 had achieved the best economic benefits, but did not get the maximum economic output from the value stream analysis results; Model 4 had obtained the best ecological benefits from the energy flow and material flow analysis results. It should focus on developing ecological benefits by combining the specific circumstances of South Jiangsu. That should increase the share of organic matter in supplementary energy and achieve multi-level material exploitation in cyclic system in order to guarantee the ecological benefits and economic benefits of this region.