The Research Of Environmental Of Livestock And Poultry Capacity Method

In recent years, environmental pollution is more and more serious in our country,and agricultural non-point source pollution caused by livestock and poultry farming is caused widely public concern. With the guidance of livestock and poultry breeding industry and supporting the sustainable development of livestock and poultry breeding pollution reduction work, the study of area of livestock and poultry breeding environment bearing capacity is indispensable. This article analyzed and compared the common method to livestock and poultry breeding approved environmental bearing capacity, put forward the corresponding methods of the scope of application, nitrogen balance of the most widely used method to further study its parameters.It try to determine the scope of the area of livestock and poultry breeding environment bearing capacity, through the empirical research to verify the exactness of the parameters. For livestock and poultry breeding of reasonable planning, reducing the livestock and poultry breeding pollution and the sustainable development of livestock and poultry breeding has important significance., at the same time provide a reference for subsequent studies on environmental bearing capacity of livestock and poultry breeding. In this paper, the research conclusions are as follows:(1) When the analytic hierarchy process is used to livestock farming environment bearing capacity calculation, It comprehensive considering various factors, more data, subjective influence, suitable for using in a macro analysis of the bearing capacity of livestock and poultry breeding. System analysis method needs to be monitored for several years and statistics of BOD, COD, TP, TN and NH4+-N, but amount calculation method is simple. It is suitable for analysis and prediction of livestock and poultry breeding environmental capacity and it can determine the sustainable development potential. Nitrogen balance method using test data accuracy is high, the research scope is not subject to constraints. It can reduce the environmental pollutants concentration at the same time of ensuring crop yield, nitrogen balance method is the most suitable for the experimental study of bearing capacity of a certain area of livestock and poultry breeding.(2) It analyzes the bearing capacity of livestock and poultry breeding nitrogen balance method, the influence factors of each parameter, the bearing capacity of livestock and poultry breeding nitrogen balance method of the experiment method of parameter values provide specific reference.(3) The Hainan province livestock farming nitrogen balance method to calculate the bearing capacity of each parameter selection are:rice, radish, cabbage, rubber, pepper, betel nut.Coconut per unit area yield are4500kg/hm2,28000kg/hm2,25000kg/hm2,1088kg/hm2, 2186kg/hm2,3715kg/hm2. Per yield needed Nitrogen is0.021kg/kg,0.0026kg/kg,0.0019kg/kg,0.097kg/kg,0.142kg/kg,0.027kg/kg. Soil nitrogen content of Hainan province is0.06-2.93g/kg. Corresponding nitrogen correction coefficient is0.14-5.25, low nitrogen content is corresponded to the high value of the conversion coefficient. Each equivalent coefficient of pigs to produce nitrogen beta is3.78kg/head. Livestock and poultry breeding waste loss rate is25.31%. Waste of livestock and poultry breeding season in utilization of rho range of25%to25%.(4) With pig equivalent calculation, the largest the bearing capacity of the unit area of rice, radish, cabbage, rubber, betel nuts, pepper in Hainan of livestock and poultry breeding are in the range of60.4-80.04head/hm2,45.79-63.89head/hm2,39.69-50.02head/hm2,145.3-156.45b.ead/hm-,126.23-135.97head/hm2,138.03-148.65head/hm2,148.65-178.04head/hm2.(5) Accounted for20%of the total rate of the planting season radish can bearing the number of pigs per unit area are40.01head/hm2, it is in the nitrogen balance formula of36.63-51.11head/hm2. Chinese cabbage planting in one season can bearing the number of pigs per unit area are32.05head/hm2, calculated in nitrogen balance within the range of31.75to40.81head/hm2; Accounted for30%of the total fertilizer rate, radish, Chinese cabbage plantings in one season can bearing the number of pigs per unit area are35.01head/hm2,28.04head/hm2, respectively within the scope of27.78-32.05head/hm2,44.72-35.71head/hm2. And conventional fertilization test area runoff concentration of COD, TP, TN and NH3-N in farmland sewage discharge standards, soil nitrogen accumulation amount is less. Verified the accuracy of the parameter selection of livestock and poultry breeding method of bearing capacity of nitrogen balance. When according to1.3times the turnip, Chinese cabbage to nitrogen fertilizer, applying fertilizer content of total rate of20%or30%, planting in one season radish can bearing the number of pigs per unit area are52.01head/hm2,45.51the head/hm2, Chinese cabbage planting season can bearing the number of pigs per unit area is41.67head/hm2,36.46the head/hm2. They are both beyond the scope of nitrogen balance calculation of bearing capacity and1.3times the normal fertilization has caused pollution on surrounding water environment and soil environment causing eutrophication.