摘要
采用模拟实验的方法 ,研究了滇池流域农田 N素的去向及施肥方法、不同肥料配方对农田 N流失的影响。结果表明 ,不同 N肥品种对农田 N的去向与利用率的影响不同 ,作物 (水稻 )对尿素的吸收利用率高于碳铵 ,施用碳铵的径流与渗漏损失大于尿素 ;合理的基肥比例及追肥次数 ,适当的种植密度及适量的 N、P、K肥配合既可提高白菜产量 ,又可降低径流中 N的流失量 ;不同改性肥料配方可以调控农田径流
By means of simulation test, the movement state of nitrogen and effect of fertilizer application on nitrogen loss from farmland runoff were studied in Dianchi watershed. The result showed that the movement state and utilization ratio of nitrogen derived from chemical fertilizers varied with different fertilizer varieties, the assimilate nitrogen and utilization ratio of crops from urea were higher than from ammonium bicarbonate, among the fertilizer nitrogen loss from farmland runoff and leaching loss, ammonium bicarbonate application were higher than urea. The rational ratio between base fertilizer and top application, proper plant-growing density, moderate fertilizer application quantities could reduce nitrogen loss and heighten cabbage yield;the different compound fertilizers and improvement fertilizers could control nitrogen pollution loading from farmland runoff.
出处
《水土保持研究》
CSCD
2004年第3期243-244,271,共3页
Research of Soil and Water Conservation
基金
云南省应用基础研究基金项目 (No.1999C0 0 11G)
关键词
施肥
氮流失
非点源污染
滇池流域
fertilizer application
nitrogen loss
non-point source pollution
Dianchi watershed
