Abstract: To solve the problem of resource waste and environmental pollution caused by excessive nitrogen application,it is essential to choose suitable nitrogen efficient maize varieties.The differences of kernel development and nitrogen efficiency of different genotypes of maize were studied under different nitrogen application.3 maize varieties under 4 nitrogen levels (N0,N1,N2,N3)were analyzed by field experiment.The results indicated that the diversities of kernel dry weight and nitrogen content in different varieties were the largest under the N3 level,which showed that the N3> N2> N0> N1.Along with the increase of the amount of nitrogen fertilizer,the kernel growth rate of double-effective(XY) and high-nitrogen-efficiency (TY) varieties were accelerated,and kernel dry weight and nitrogen content in different periods had significantly increased.With the increase of nitrogen fertilizer,the utilization rate of the nitrogen fertilizer was effectively improved and the transfer of nitrogen in maize plants was promoted.The yield of low-nitrogen-efficiency(LY)in low nitrogen (N0,N1) level was maintained a high level,but with the amount of nitrogen increased,the seed dry weight and nitrogen content had no obvious change,the yield was even decreased,resulted the efficiency of nitrogen was decreased.The yield of double-effective(XY) in low nitrogen and high nitrogen conditions were both kept a high level,it was suitable for widely cultivated.The low-nitrogen-efficiency(LY) was suitable for cultivated in poor soil and poor conditions of nitrogen.

Key words: Maize, Kernel development, Nitrogen content, Nitrogen use efficiency

CLC Number: 

• S143.1

• S513