水土保持学报2012，Vol.26Issue(2)：16-20,5.
氮肥后移对引黄灌区水稻产量和氮素淋溶损失的影响
Effect of Postponing N Application on Rice Yield and N Losses in Yellow River Irrigation Area
摘要
Abstract
A field experiment was conducted to study the effect of postponing N application technology on rice yield and the change of characteristics of the concentration of NH＋4,NO-3and TN in the surface water and leakage water of the paddy field in Yellow river irrigation area.There are 5 treatments in this experiment,no nitrogen fertilizer（CK）,farmer conventional fertilizer treatment（N300）,reduction fertilizer treatment（N240）,postponing N applicationⅠ（N240/3） and postponing N applicationⅡ（N240/4）.The results showed that： N240/3 treatment reduced the amount of nitrogen applied by 20% compared to N300 treatment but had no reduced rice yields significantly.The nitrogen use efficiency of N240/3 treatment was 40.5% which increased by 8.8% compared to N300 treatment.After one to three days nitrogen fertilizer employed each time,the concentration of TN and NH＋4 in surface water attaining the bigger value,then decreasing faster.However the concentration of NO-3 in surface water attaining the bigger value at three to five days after nitrogen fertilizer employed each time,9 days after fertilizer employed was the key time to avoid gross of three kinds of nitrogen in the water surface of the paddy field lost.N300 treatment nitrogen leaching occurs mainly in the tillering stage and postponing N application treatments mainly occurs in the tillering stage to flowering stage and NO-3-N was the main form of nitrogen loss,which accounted for TN loss from 74.14% to 79.44%.The amount of N240/3 treatment（29.78 kg/hm2） total nitrogen loss was 14.73 kg/hm2 fewer than FP treatments（44.51 kg/hm2） per hectare and ratio decreased 33.1%.Considering the rice yield and environmental factors,N240/3 treatment was one of environment-friendly technology that could be applied in rice cultivation in Yellow River irrigation area.关键词
氮肥后移/水稻/氮素流失/引黄灌区Key words
postponing N application/rice/N losses/Yellow River irrigation area分类
农业科技引用本文复制引用
刘汝亮,李友宏,张爱平,王芳,赵天成,陈晨,洪瑜,杨正礼..氮肥后移对引黄灌区水稻产量和氮素淋溶损失的影响[J].水土保持学报,2012,26(2):16-20,5.基金项目
国家水体污染控制与治理科技重大专项 （）
环保部公益性行业科研专项 （）
国际植物营养研究所项目 （）
