Comparative Analysis Of Energy Flow,Energy Value And Economic Benefit Of Circulating Agricultural System In Organic Fertilizerproduction In Pasture Area Of Subtropical Hilly Region

The structural characteristics of the traditional agricultural system are linear,mainly the combination of planting,aquaculture and processing industry.The main problems of the traditional agricultural system are the single structure,the structure Chain is not complete,structural network is not reasonable.As a call to focus on the integration of agriculture and the ecological environment,abandon the traditional agricultural model to carry out and ignore the ecological environment coexistence with the concept of environmental conservation cycle agriculture model,technical support is low input,low emission,recycling,waste recycling Use,so as to achieve the common prosperity of agriculture and the environment.Based on the viewpoint of system theory,environmental conservation cycle agriculture is the coordination of waste pollution from the beginning,the process control,the end of the subtraction,the reduction of recycling and other basic principles and coordination of agricultural layout,industrial structure construction and Production process,making agricultural production into a branch of the ecological environment system.The evaluation of the cycle agriculture model for the micro evaluation of most of the only stay in the cycle of agricultural structure of the structure,efficiency or environmental impact of the description stage,on the model of ecological,environmental and economic benefits of quantitative evaluation of the lack of further needs.In this paper,taking the research base of recycling agriculture in Jinjing Town of Changsha County in Hunan Province as an example,the comparative benefits of “single cattle”,“forage grass-cattle” and “forage grass-cattle-organic fertilizer” were analyzed.(1)”Grass-beef cattle-organic fertilizer production” cycle of the model has a high proportion of organic inputs,is environmentally friendly mode,light energy utilization rate of 0.96%,higher energy flow cycle index.But the subsystems also need to be more perfect,such as the system of planting system multiple cropping index is low,organic fertilizer production of modern technology investment is low,while the degree of agricultural mechanization is not enough,resulting in the mode of production and investment ratio is not high.(2)Compared with the “single cattle” model,the self rate of self-sufficiency,emergy investment rate and net value of energy value of the “pasture-beef cattle-organic fertilizer production” and “grass-raising” Showing a significant increase.It is better to use the natural resources,the development level and the production efficiency are also improved,the dependence on the environment is reduced,and the environmental load rate and the energy value are discarded.The results show that the “ According to the ”single cattle” model,the environmental load rate of ”forage-beef cattle-organic fertilizer production” and ”grass” was significantly reduced,indicating that ”grass and cattle”,”forage-beef cattle-organic Fertilizer production “model of the destruction of the environment smaller,more ecological benefits,at the same time,the urgent need to improve the level of technological development of the system.And the value of the feedback rate and the index of sustainable development of these two indicators to analyze,showing ”forage-beef cattle-organic fertilizer production” model the best,”grass cattle” mode,followed by ”single cattle” mode Poor,indicating that the grass-beef cattle-organic fertilizer production ”model of the strongest self-organization,the system ’s sustainable development of the best performance.(3)The results show that: compared with the “single cattle” model,the gross output value,net output value and profit of the model of “forage grass-cattle-organic fertilizer” increased by 18.3%,76.7% and 88.4% respectively.Further from the cost and investment analysis of the two aspects pointed out,whether it is the cost efficiency and utilization efficiency,or investment efficiency and investment results,are showing a “forage grass-cattle-organic fertilizer” mode is best,“forage grass-cattle”mode is second,the “single cattle” mode is worst.But simply from the perspective of labor inputs,the labor costs of “grass-raising and cattle-raising” and “grass-raising cattle” mode accounted for 26.8% and 25.9% of the total cost,57.7% and 56.2% higher than “single cattle”.That is,compared with the “single cattle” model,the man-made input of the model of “forage grass-cattle-organic fertilizer” and “forage grass-cattle” is obviously higher,we need to accelerate the application of mechanization technology.Compared with “single cattle” mode,the total output value and net output value of “forage grass-cattle-organic fertilizer” model increased by 1.2 times and 4.3 times;After deducting labor cost,compared with “single cattle” mode and “forage grasscattle” mode,the net income of “forage grass-cattle-organic fertilizer” mode increased by 8.60 times and 1.16 times.It was clarified that the model of “ forage grass-cattle-organic fertilizer ” could not only effectively prevent the environmental pollution caused by the wastes from cattle farms,but also has better economic efficiency,it’s worthy of popularization and application.