4个玉米品种氮素利用效率的比较研究

以郑单958、农大108、京单28、京科308为试验材料,研究了不同玉米品种产量、干物重、氮含量、氮利用效率的差异.结果表明:4个玉米品种产量、总吸氮量存在一定程度的差异,氮利用效率差异均不显著.植株干重、子粒氮含量、总吸氮量与产量显著相关,子粒氮含量对产量的直接影响最大.植株干重与子粒氮含量显著相关,植株干重越大子粒氮含量越高;子粒氮含量与植株干重对产量的影响不同品种之间存在差异;氮收获指数与产量呈负相关.

Comparison on N Utilization Efficiency of Four Maize Varieties

The difference in the yield, biomass, N content and N use efficiency of four maize hybrids (Zheng-dan958, Nongda108, Jingdan28 and Jingke308) were studied.The experiment was suggested that there were differ-ence in the yield and plant total amount of N absorption among four maize hybrids, but the N utilization efficiency was just the opposite.There were obvious mutuality in the plant dry matter weight, grain N content and total amount of N absorption with yield, grain N content had maximal immediate effect to yield.There were obvious positive correlation in the plant biomass and grain N content.The difference were observed the effect of plant dry matter weight and grain N content to yield among hybrids.