Effects Of Different Materials On Soil Nitrogen,Phosphorus And Potassium Leaching Characteristics In Hetao Irrigation Area

To improve fertilizer utilization rate and ensure grain crops stable effect under the premise of high yield,reduce fertilizer nutrient leaching,reduce agricultural fertilizer non-point source pollution,is essential for the coordination of food resources and environmental issues,but also an important issue facing the sustainable development of agriculture.The intensification of crop planting is high in Hetao Irrigation District of Inner Mongolia,But the agricultural non-point source pollution caused by unreasonable fertilization is also serious.Nutrient leaching is the main way for the loss of fertilizer nutrients in Hetao Irrigation District,but the dynamic characteristics of nutrient leaching and the technical measures for control and control have not been paid enough attention.Therefore,this article in 2015-2016,aiming at the key problems in Hetao irrigation fertilizer non-point source pollution,pollutants from the source of governance,has important scientific value and practical significance to study the agricultural non-point source pollution control measures of fertilizer nutrient leaching characteristics in Hetao irrigation area and the resulting.The field trials were arranged 9 treatments with 3 replications of farmland in Hetao Irrigation District,different materials processing conditions,the crop growth period soil water nitrogen,phosphorus,potassium and PH leaching dynamic distribution characteristics,qualitative and quantitative analysis of the.In conventional fertilization as control,using field experiment on soil water loss control measures were studied.The main research results are as follows:(1)with the increase of soil water nitrogen leaching layer increased trend showed decreased after 0 100cm leaching layer nitrate accumulation was positively correlated with the amount of fertilizer amount of 0-40cm leaching layer the concentration of nitrate nitrogen leaching was significantly higher than other layers;in different materials processing conditions,PAM,B,C,PAA treatment effect.Compared with CK treatment,the total nitrogen concentration decreased by 24.14%,the total soluble nitrogen decreased by PAM,the nitrate nitrogen decreased by 28.71%,ammonium nitrogen decreased by,and the nitrate nitrogen content in HK treatment increased by compared with that of CK.(2)soil phosphorus leaching increased with water layer has been decreased,phosphorus mobility is very small,not easy from the soil phosphorus leaching down,mainly concentrated in the 0?40cm;in different materials processing conditions,B,C,PAA,PAM treatment,F treatment at seedling stage of crop is CK treatment of total phosphorus concentration increased by 38.43%.(3)potassium ion with soil leaching water migration occurs easily,can be leached into the soil 100cm,soil water with potassium leaching layer increase potassium ion concentration was not obvious in different law;materials handling cases,B,C,PAA,PAM,the treatment effect is significant.