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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,在两种密度下,对7个玉米品种在7个地点的产量特征及适应性进行分析。结果表明,郑单958、CX712和陕单609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。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,7个品种可被划分为四类,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。
Using the method of variation coefficient, regression coefficient, high stability coefficient, nonparametric measurement and AMMI model, the yield characteristics and adaptations of seven maize cultivars in seven locations under two densities Sex analysis. The results showed that Zhengdan 958, CX712 and Shandan 609 all showed high production potential and strong stability under low density and high density, with good adaptability and suitable for popularizing planting in Northwest China. Based on UPGMA clustering analysis, the seven cultivars were divided into four groups according to the multiple parameters of high yield index (Pi and P’i), class Ⅰ (CX712, Shandan 609 and Zhengdan 958) Class II is Nonghua 101; Class III is Xiangyu 335; Class IV is Longdan 9 and Jinjin 8.