Nitrogen removal and crop growth in a trial soil column wastewater irrigation system are observed

and the impact of increased wastewater organic carbon content on them are tested.It is shown that with the increase of wastewater organic carbon content

the volume of drainage

the amount of leached nitrogen(ammonium

nitrate and total nitrogen) and COD will increase

while the dry matter yield of the crop and the amount of nitrogen uptaken by the crop will decrease.The changed soil circumstance resulted from increased wastewater organic carbon content has a negative impact on crop growth.