Release Of Nitrogen And Phosphorus From Animal Manure Simulated Direct Returning To Farmland

Recently,with development of economy and improvement of people's living standards, The demands for livestock products are increasing.With the expansion of production scale, the pollution brought by the animal manure emissions is increasingly serious.Since many animal manure failed to be treated and used effectively,a large number of Nitrogen and Phosphorus element had been lost,which resulting in the pollution and hazards of the environment,and likely to endanger people's health.Animal manure in N,P element is one of the main reasons that caused the loss of agricultural non-point source pollution.Agricultural non-point source pollution with a random,the complexity of the mechanism of the process,the uncertainty of the emission of pollutants and so on.The accurate calculation of agricultural non-point source pollutants is very difficult,it make the research of non-point source pollution of agricultural is considerable difficult.The N,P elements and organic matter would disorderly discharged from rainfall and irrigation water by applying animal manure,causing serious water pollution.In addition,the improper application of animal manure unconsciously cause serious agricultural non-point source pollution,decline the quality of the ecological environment.Some methods can be taken to control non-point source release of animal manure pollutants,such as reasonable application of animal manure, regulate pollution management culture,to raise animal manure utilization field,resources to the commercialization of animal manure;the development of organic agriculture and so on.At present,the biological release of animal manure on the environment of non-point source pollutants was rare quantitative studied.Therefore,this article focuses on the influence of alternating drying and wetting conditions and permanent flooding conditions,continuous application of animal manure during the non-point source pollutants released by the amount of fertilizer and leaching.By quantify the loss of N,P in the process of apply animal manure alternating drying and wetting conditions for the completion of estimates,as well as under conditions of continuous flooding.Estimate the contribution rate of the N,P emissions from animal manure,make a conclusion.Flooding conditions,the three largest TN emission from overlying water is ZF3 (11.01mg)＞JF3(10.17mg)＞NF3(9.89mg),the three largest TN emission from under the water is JF3(16.44mg)＞NF3(11.22mg)＞ZF3(11.07mg),Both overlying water and under water,has the same characteristics that the greater the application the stronger capacity to release of N.The total volume of emissions and the application has a positive correlation,and compared with the overlying water,the release of TN in under water is always higher. Flooding conditions,the three largest release of TP in the overlying water is ZF3 (0.34mg)＞NF1(0.32mg)＞JF2(0.29mg),the three largest release of TP in the under water is NF3(2.59mg)＞ZF3(2.54mg)＞NF2(1.80mg).Both overlying water and under water,has the same characteristics that the greater the application the stronger capacity to release of P. The total volume of emissions and the application has a positive ton'elation,and compared with the overlying water,the release of TP in under water is always higher.Flooding conditions,the order of units release amount of N,P from animal manure is ZF1＞ZF2＞ZF3,NF1＞NF2＞NF3,JF1＞JF2＞JF3.Units release amount of N,P from the treatment which applied small amount of animal manure is greater than applied the big one.Alternating drying and wetting conditions,the big leaching amount treatments release larger quantity of N,P than the small leaching amount;the big application of animal manure release larger quantity of N,P than the small application.The pre-trial phase of this test,N,P concentration changes violent.With the passage of time quantity,the release amounts of N,P turn to stabilized.Alternating drying and wetting conditions,it can be found that the release of N is much larger than the release of P,a difference of as much as nearly an order of magnitude.This article concluded evenunlly that following it needs to moditify the pattern that animal manure applied,make further research on variation of COD,heavy metals.Between the alternating drying and wetting and permanent flooding conditions,which one is more conducive release of N,P to soil.And the conclusion need to be demonstrated in the future based on the laboratory experiments.