Soil Nitrogen Seasonal Transformation Characteristics Under Different Irrigation Ways

By the field irrigation and fertilization experiment,the nitrogen seasonal transformation characteristics under film hole irrigation and border irrigation were studied.The results showed that the nitrate nitrogen mainly distributied near the film hole in film hole irrigation and relative uniformity in vertical soil profile.In border irrigation,the nitrate nitrogen distribution concentrated in vertical soil profile near fertilization point.The greater of irrigation quota,the faster of nitrate nitrogen seasonal reduced and deeper the reduced depth,and the nitrate nitrogen cumulative amount larger in 80～100cm depth.In harvest period,the nitrate nitrogen content in whole soil profile in film hole irrigation was 97.7mg·kg-1,in border irrigation was 114.55mg·kg-1.