畦灌表施肥料条件下氮素入渗量估算模型

It researched the estimation model of nitrogen infiltration for surface fertilizer application under border irrigation. With this infiltration model, observation of surface water flow motion and nitrogen concentration, it can estimate fertilizer distribution after irrigation along the length direction, and avoiding big workload of determining nitrogen content before and after irrigation by sampling test. In march of 2010, the test was carried out in border check for winter wheat , which was in Shuangmiao breeding farm, Nanpi County, Hebei Province. There were six testing programs and separately observed water flow advance and recession time, nitrogen concentration of overland flow and concentration of nitrate nitrogen, ammonium nitrogen, urea nitrogen before and after irrigation. Compared with measured value from sampling test, the average relative error is between 6.71%~12.35% by using estimation model of nitrogen infiltration. Results showed that estimation model of nitrogen infiltration for surface fertilizer application under border irrigation could be applied to estimate each point nitrogen infiltration along the length direction and evaluate the fertilization quality, only observing water flow advance and recession procedure and concentration change of overland flow with convenient observation and less workload.