Comparative Study on Nitrogen Utilization Characteristics of Spring and Summer Maize Plants in Hebei Plain

• 1、College of Agriculture,Hebei Agricultural University,Hebei Key Laboratory of Crop Growth Regulation,Baoding 071001,Hebei,China.

Abstract：In order to investigate the response of nitrogen distribution and utilization characteristics of vegetative organs in corn to climatic conditions under different sowing dates, Zhengdan958 and Xianyu335 were used as experimental materials to conduct a field experiment. Two sowing dates were set as spring and summer maize (April 28 and June 19) for research. The results showed there was no significant difference between nitrogen accumulation in summer maize，but the nitrogen accumulation of Zhengdan958 in spring maize was 23.2% higher than that of Xianyu 335. The nitrogen accumulation of the same variety was significantly higher in summer than that of spring maize. SPAD of spring sowing Xianyu335 existed a significant decline trend and a rapid aging rate. The spring sowing Xianyu335 suffer to obvious drought stress during flowering, and its stem and sheath nitrogen transport, utilization, and contribution to grains were significantly lower than those of summer sowing. However, Zhengdan958 had no significant difference in nitrogen redistribution and contribution to grain between the two sowing dates. The characteristics of nitrogen utilization in Xianyu335 were significantly higher in summer than in spring; Zhengdan958 showed a 27.5% increase in nitrogen fertilizer partial production in summer compared with spring maize, but there were no significant differences in nitrogen utilization efficiencyand nitrogen harvest index during sowing dates. In summary, spring sowing maize is susceptible to drought stress, which affects grain storage capacity and significantly inhibits nitrogen uptake and utilization.

Keywords： Maize Sowing date Nitrogen use efficiency Nitrogen reuse