Effects of combined applicaion of polymorphic nitrogen and nitrification inhibitors on soil nitrogen transformation
Nitrogen nutrient efficiency has a great significance to improve crop yield and quality,and the nutrient morphology regulation strategy of ammonium and nitrogen synergy is one of the means.In order to explore the effects of organic nitrogen and inorganic nitrogen source application and nitrification inhibitor on soil ammonium nitrogen dynamics,indoor soil culture experiments were conducted,5 treatments with different proportions of ammonium thionitrate and oxamide were set up,and the ratios of ammonium thionitrate and oxamide was 100％:0％,0％:100％,25％:75％,50％:50％,75％:25％.In addition,nitrification inhibitor DMPP treatment was added to each group to explore the effect of different nitrogen sources of inhibitor DMPP treatment on nitrogen conversion in fluvo-aquic soil(pH 8.25)and paddy soil(pH 5.48).The results showed that the combined application of slow-release nitrogen oxalamide and ammonium nitrate significantly affected the form and rate of soil ammonium thionitrate nutrient supply.Until the end of the 10th day of incubation,the ammonium and nitrate nitrogen in the soil of slow-release nitrogen fertilizer oxalamide still showed a high level.The addition of DMPP increased the ammonium nitrogen content of all treatments,reduced the nitrate nitrogen content,and improved the apparent nitrification rate and the ratio of ammonium to nitrate nitrogen of soil.In summary,the different proportions of oxamide to ammonium thionitrate and the way of DMPP could realize the change of the ratio of ammonium to nitrate nitrogen in soil,and improve fertilizer utilization rate.
nitrification inhibitorsoxamideammonium thionitratenitrogen formammonium to nitrate nitrogen ratio
万方数据
维普
