Straw Returned To Reduce Fertilizer On Soil Nutrients And The Effect Of Phosphorus Leaching

There is an outstanding problem in agricultural non-point source pollution in Chaohu area,so that the the prevention and control of farmland pollution is taken seriously.We improve the soil,enhance soil retention performance,and increase crops output by use of straw returned.We also take the use of humic acid fertilizer to balance the crop yield and reduce the farmland soil nutrient leaching.The positioning of the experiment in this paper set up the process: 1,optimization of fertilizer + straw returned.2,optimization of fertilizer+ straw returning full amount.3,optimization of basal fertilizer + humic acid fertilizer applied into + no straw returned.4,optimization of nitrogen and phosphorus fertilizer decreased 20% + straw returning full amount.5,optimization of nitrogen and phosphorus fertilizer decreased 40% + straw returning full amount.We search the straw returned to reduce fertilizer in Chaohu lake,and find the applying humic acid fertilizer + optimization on soil properties can make the influence on crop growth and nutrient leaching as well as the influence on the yield of crops after fertilization.Here are the main findings:(1)The amount of soil nitrogen,organic matter,alkali solution,instant phosphorus and instant potassium were increased by the crop and the fertilized humic acid fertilizer.Under the same conditions,the effect of reducing nitrogen and phosphorus fertilizer on soil nutrient content.(2)The loss of total phosphorus and soluble phosphorus in rice season soil was reduced by the use of humic acid fertilizer.Under the condition of same fertilization,In2015,the rice season fertilizer + straw returned and optimize the basal fertilizer + humic acid fertilizer applied into + no straw returned in the soil total phosphorus leaching content in leaching solution scope is: 0.084 ~ 0.281 mg/L,0.080 ~ 0.241 mg/L;Soluble phosphorus is 0.080 ~ 0.191 mg/L,0.076 ~ 0.186 mg/L.Under the condition of straw remanding,the loss of total phosphorus and soluble phosphorus in the soil was reduced by the appropriate reduction of the nitrogen phosphorus fertilizer.In 2015,the rice season fertilizer + straw returning full capacity,optimize the nitrogen and phosphorus fertilizer decreased 20% + straw returning full quantity,optimization of nitrogen and phosphorus fertilizer decreased 40% + straw returning full quantity of soil total phosphorus leaching leaching solution in the range as follows: 0.086 ~ 0.305 mg/L,0.070 ~ 0.247 mg/L,0.065~ 0.212 mg/L;Soluble phosphorus is 0.082 ~ 0.206 mg/L,0.078 ~ 0.177 mg/L,0.063 ~0.171 mg/L.(3)In different planting seasons,straw reproducing and humic acid fertilizer fertilisers increase crop growth and increase crop yields.Straw returned can effectively improve the soil nutrient content,humic acid fertilizer could promote the crop growth,increase the increase of soil nutrient content,and reduce soil p nutrient losses in leaching solution.In the case of the increasing pollution of the source of agricultural products.It is possible to reduce the investment of chemical fertilizers through straw returned,which can bring positive effect to the environment.The soil nutrient content of farmland soil is increased by the use of humic acid fertilizer,and the loss of soil phosphates is reduced,thereby preventing the pollution and economic loss of the environment.