Effect of Powered Straw Returning Method on Soil Nitrogen and Phosphorus Leaching Inhibition
In order to study the resistance and control effect of straw powder construction isolation layer on soil nitrogen and phosphorus leaching,and to provide a theoretical basis for controlling nitrogen and phosphorus non-point source pol-lution,five treatments,including blank control(T1),single-layer deep burial(T2),double-layer deep burial(T3),single-layer deep burial+soil mixing(T4)and soil mixing(T5),were set through potted pepper test.The straw iso-lation layer was constructed,and leached water was taken at different time points to test the nitrogen and phosphorus content in leached water,and the inhibition effect of different construction methods of straw isolation layer on soil nitro-gen and phosphorus leaching was determined.Compared with other treatments and control,T4 showed an obvious advan-tage in inhibiting the leaching effect of nitrogen and phosphorus.The cumulative leaching amount of total nitrogen,total phosphorus,available phosphorus,ammonia nitrogen,nitrate nitrogen and nitrous nitrogen was reduced by 50.6%,42.64%,25.8%,11.4%,65.6% and 46.9%,respectively,and the biomass of pepper was increased by 10.54%.All the four treatments showed a tendency to inhibit the leaching effect of nitrogen and phosphorus,but the degree was dif-ferent.Its concrete application to actual agricultural production needs further research.
straw returning to fieldisolation iayereluviationsoil nutrientieaching effect
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