本研究运用变异系数法、回归系数法、高稳系数法、非参数度量法、AMMI模型等分析方法，以产量为指标，在两种密度（区试密度和区试密度+1.5万株/hm2）下，对7个玉米品种在7个地点的产量特征及适应性进行了分析。结果表明：郑单958、CX712和陕单609三个玉米品种在低密度和高密度条件下均表现出较高的生产潜力和较强的稳定性，具有良好的适应性，适合在西北地区推广种植。进一步以丰产指数Pi和P′i等多个参数为指标，进行类平均法（UPGMA）系统聚类分析，试验采用的7个品种可以被划分为四类，Ⅰ类为CX712、陕单609和郑单958；Ⅱ类为农华101；Ⅲ类为先玉335；Ⅳ类为陇单9号和真金8号。
英文摘要:
In present research, the yield properties and adaptability of seven maize varieties which were grown in seven planting places under two density (Regional Test density and Regional test density+) were analyzed with coefficient of variation(CV), coefficient of regression(bi), coefficient of high stability(HSCi), non-parameter measurement(Nij), AMMI model. The results showed that Zhengdan 958, CX712 and Shandan 609 demonstrated higher yield potential and stronger stability under the condition of both low and high density, and with good adaptability. It is anticipated that those maize varieties would be suitable for cultivation in the northwest region. Furthermore, those varieties were classified into four group by UPCMA analysis of parameters including productivity indexes Pi, P′i and others. The hybrid Zhengdan958, CX712, Shandan609 were classified group I, the group II was Nonghua101, group III Xianyu335, and groupIV for Zhenjin8 and Longdan9.
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