The dynamics of soil nitrate nitrogen leaching and contamination of the groundwater in high-yield farmland
高产农田土壤硝态氮淋失与地下水污染动态研究

The field scale investigation reveals that in high-yield farmlands where the managements of the irrigation and fertilization are different in Huantai County of Shandong Province.The dynamics of nitrogen leaching and the groundwater pollution quite differ from each other.Soil content of NO3-N keeps decreasing after spring and its concentration of NO3-N in the groundwater correspondingly increases gradually.The concentration in the groundwater dramatically changes and reaches the maximum after the raining season,demonstrating that the direct contamination results from the nitrogen fertilization.This is probahly related to the more irrigation,lighter soil texture and shallower groundwater in this area.