Effects of CRNF Application on Nitrogen Dynamics and Loss of Leachate Water in Spring Maize Soil in Hilly Area of South China
XIE Yong;RONG Xiangmin;HE Xin;SHI Dunjie;TANG Li;LIU Qiang;ZHANG Yuping;Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use,Hunan Provincial Key Laboratory of Nutrition in Common University,National Engineering Laboratory on Soil and Fertilizer Resources Efficient Utilization,College of Resources and Environment,Hunan Agricultural University;
In order to improve the nitrogen use efficiency and reduce the resource waste and the risk of environmental pollution,a study on the leakage loss of controlled release nitrogen fertilizer(CRNF)application in hilly area of South China was conducted.The effects of CRNF(T3~T6)application on nitrogen dynamics and loss of TN,NO3-—N and NH4+—N in leachate water under different treatments in spring maize soil were explored.The results showed that the leakage water was 3 888~3 948 L when the nitrogen application rate was 168~240kg N/hm~2,hence fertilizer application rate had no significant effect on the leakage volume(P0.05).Average leaching loss concentration of TN,NO3-—N and NH4+—N under T3 treatment were as follows 32.66mg/L,29.41mg/L,and 0.26mg/L.Compared with the application of common urea(T2),T3 treatment with the same amount of nitrogen application rate decreased by 24.99%(P0.01),25.56%(P0.01)and 25.71%(P0.05),respectively.Meanwhile,the loss load decreased by 24.10 %(P0.01),25.62 %(P0.01)and 18.97 %(P0.05),respectively,and namely 53.07,47.14 and 0.47 kg N/hm~2.When the nitrogen fertilizer application rate was reduced by 10%,20%,30%,the corresponding average TN loss concentration were 28.81,26.50 and 24.34 mg/L,which decreased by11.79%(P0.05),18.86%(P0.05),25.47%(P0.05)compared to T3.Similarly,the loss load were41.78,36.62,and 33.90 kg N/hm~2,which decreased by 21.27%(P0.01),31.00%(P0.01),36.12(P0.01),respectively.NO3--N is the major component of leakage nitrogen loss,which accounted for88.83%~92.75% of TN loss load,and DON was also not negligible.During the planting of spring maize in dry land,the CRNF application rate with 192kg/hm~2 could effectively reduce the loss of nitrogen leaching and the risk of environmental pollution,and even increase yield and efficiency.
【Fund】： 国家科技支撑计划项目(2014BAC09B01);; 省教育厅平台项目(15K056)
【CateGory Index】： S513
【CateGory Index】： S513