Abstract: In order to improve the utilization and economic efficiency of nitrogen and reduce agricultural pollution and groundwater pollution. With the soil of open-field vegetables in Hebei Province as the research object,the location experiment and laboratory analysis were carried out to investigate the effects of different fertilizations on yields, fertilizer-nitrogen use efficiency, the content of NO₃^--N and nitrogen leaching. It was shown that there was significant influence of rainfall, irrigation methods and nitrogenous fertilizer on the concentration of NO₃^--N. The more nitrogen fertilizer,the higher content of NO₃^--N. The higher NO₃^--N content in soil and soil leachate indicated the lower vegetable yield nitrogen use efficiency, and the greater risk of the nitrogen leaching loss. Total N application reduced 30% than conventional fertilization and phosphoric and potassic fertilizer app location were not changed, the yield of optimization in nitrogen fertilizer was higher than conventional fertilizing, and the yield of vegetables was increased by 9.2%, and the NO₃^--N content was decreased by 1.3%-43.2%, and the application nitrogen use efficiency was increased by 8.3%-30.6% than conventional fertilizing. Compared with conventional fertilization, optimized fertilization measure improved economic and environmental benefits significantly and were recommended that could increase farmer income and environment-friendly. The nitrogen fertilization measures were recommended.

Key words: Open-field vegetables, Nitrate-N, Leaching characteristics

CLC Number: 

• S143.1