Effects Of Cow Dung Application On Soil Nitrogen And Phosphorus Migration And Leaching Loss Of Black Soil

After applying manure in the fields, the excess agricultural pollutants along with rainand their drainage into surface water bodies, causing pollution to the environment. So how toimprove farmland nitrogen, phosphorus bioavailability, reduce nitrogen, phosphorusadditional loss has become a focus of concern in recent years.Therefore, this study simulateddifferent amounts of farmland manure application, Conducted outdoor and indoor potcultivation soil column leaching simulations,which based on annual rainfall simulationChangchun City area,to determine the nitrogen and phosphorus accumulation and releaseconditions in different soil layers and different stages. Provide rationalization proposal andPrevention recommends for rational use of manure, reduce agricultural nonpoint sourcepollution, protecting water quality and safety of the environment.After application of cow dung, ammonium nitrogen content decreased with depth, withincreasing levels of nitrate in deeper layers, and the more manure application, the moreammonium nitrogen and Nitrate content. Nitrate content in the leachate became a rising trendin the first, and later dropped. Ammonium nitrogen content changes smoothly, with theincrease in the numbers of leaching, the trend is to reduce the concentration of ammoniumnitrogen. The nitrogen content in the leachate was increased with the increased amount ofmanure. Fertilization can clearly has a significant impact on available phosphorus in soil,various forms of inorganic phosphorus content, and soluble phosphorus in the leachate, totalphosphorus concentration. With the increase of the amount of cow dung, nitrogen andphosphorus content in soil profile and leachate also increased.There are also has obviously influence on soil nitrogen and phosphorus undercircumstances of vegetation. The increased amount of cow dung could significantly increasenitrate nitrogen and ammonium nitrogen concentration in each section of soil, but thenitrogen and ammonium nitrogen in surface profile is higher than in the deep profile. Withdifferent dosage of cow dung, nitrate nitrogen and ammonium nitrogen concentration in theleachate have the same change trend,which are all increased with the increase of dosage ofcow dung, But the change trend in the process of leaching and different.(Soluble phosphorusand total phosphorus has the similar trend with nitrogen). the nitrogen leaching form is givenpriority to with nitrate nitrogen. Along with the increase of the cow dung, Olsen-P contentin soil also increased, Especially more obvious influence on surface of available p content.Application of cow dung can change all kinds of inorganic phosphorus or proportion of the total inorganic phosphorus in order, without applying cow dung, Fe-P﹥Ca-P﹥AL-P﹥O-P，however, Fe-P﹥AL-P﹥Ca-P﹥O-P,in the case of applying cow dung. it is turns outthat application of cow muck can form soil inorganic phosphorus transformation to AL-P, andincrease the higher plant effectiveness of inorganic phosphorus content in black soil.