高密度条件下不同基因型玉米高产特性及耐密性研究

Study on the Property of Density Tolerance in Maize

以13份不同基因型玉米品种为材料,采用裂区试验,在玉米各生育期对玉米产量及产量性状和农艺性状进行测量,分析不同基因型玉米的高产特性及耐密性。结果表明,在75 000株/hm2密度下,登海618产量最高,其次为农大372、先玉688,登海518产量最低。在90 000株/hm^2密度下,滑玉168产量最高,其次为农大372、迪卡517,登海518产量最低。通过隶属函数分析、主成分分析等方法对品种耐密性进行综合评价,结果表明,7个指标可转换为3个独立指标作为耐密性指标进行综合评价,从中筛选出耐密性强的品种农大372、联创808、利单618和先玉688,登海518、登海618和裕丰303耐密性较弱。

The density tolerance property of 13 maize varieties were analyzed under two densities.Experiment was conducted in split-plot design,with each of density was assigned to a whole plot and each variety was assigned to a subplot.Maize grain yield,yield components and some agronomic traits were investigated at different maize growth stages.Under the density of 75 000 plants/ha,Denghai618 yielded the most,followed by Nongda327 and Xianyu688,and Denghai518 had the lowest yield.Under the density of 90 000 plants/ha,Huayu 168 obtained the highest yield,then followed by Nongda327 and Dika517,and the yield of Denghai518 was the lowest.The properties of maize high yield and density-tolerance were studied by fuzzy membership function and principal component analysis.Seven morphological indexes of maize were recombined into three independent comprehensive indexes for maize variety evaluation.Based on the three comprehensive indexes,the varieties with highly density tolerance were selected,which included Nongda372,Lianchuang808,Lidan618,Xianyu688,and the varieties with weak density tolerance,that is,Denghai518,Denghai618,and Yufeng303,were also identified.