Effect of nitrogen application time on dynamics of nitrate content and apparent nitrogen budget in the soil of summer maize fields
施氮时期对玉米土壤硝态氮含量变化及氮盈亏的影响

Applying N at high rate year by year in high maize yield production in China resulted in increasing basal soil N content and decreasing N fertilizer utilization efficiency. Moreover, it caused severe underground water pollution in many areas. Therefore, agricultural researchers are facing how to optimally use N fertilizer. There were a lot of researches on the relationship of N fertilizer application with crop growth and yield components. Due to high precipitation and temperature, soil N mineralization and ...