Effect of Reclaimed Water Irrigation on Soil Nitrogen and Groundwater in Different Groundwater Depth

With the development of reclaimed water irrigation,the effect of sewage irrigation in soil and groundwater is attentive by people.By the field expeiment,the effect of reclaimed water irrigation on nitrogen transport of soil and groundwater at different groundwater depth was discussed.The experimental results indicated that the nitriate content of soil obviously increased after irrigation,under the same water depth,the more irrigation amount was the more nitrate content was respectively.Nitrate concentration of groundwater at the different depth increased by 11.71mg/l,15.82mg/l,15.16mg/l.When the irrigation amount was B1.Nitrate concentration of groundwater at the different depth increased by 33.881mg/l,30.37mg/l,25.29mg/l respectively when the irrigation amount was B2.The pollution risk of nitrate which was produced by leaching and nitrification was more danger to shallow groundwater.