Estimation on Nitrogen Fertilizer Saving Potential of Some Summer Maize Hybrids in Beijing-tianjin-tangshan Area of China

In this study,the N fertilizer-saving potential of different maize hybrids grown in Beijing-tianjin-tangshan area was estimated in the soil of long-term fertilization.The result indicated that in comparison with the check hybrid JY7,JD28 got much higher yield at both low and high N supplies.The potential for saving N fertilizer in JD28 was 33.7%,which meant huge amount of N fertilizer could be saved by using this hybrid,and should be helpful in determine the optimum N fertilizer input to realize efficient N utilization and higher yield simultaneously.