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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。
Taking Zhengdan 958, Nongda 108, Jingdan 28 and Jingke 308 as experimental materials, the differences of yield, dry matter weight, nitrogen content and nitrogen use efficiency of different maize cultivars were studied. The results showed that the yield and total nitrogen uptake of four maize cultivars differed to some extent, but the nitrogen use efficiency was not significantly different. Plant dry weight, grain nitrogen content, total nitrogen uptake was significantly correlated with grain yield, and grain nitrogen content had the greatest direct impact on grain yield. Plant dry weight and grain nitrogen content were significantly correlated with plant dry weight, the higher the nitrogen content of the grain; grain nitrogen content and plant dry weight on the yield of different varieties there is a difference between; nitrogen harvest index and yield was negatively correlated.