扬麦16、宁麦18超高产群体特征及株型指标研究

The Population Characteristics and the Plant Type Index of Yangmai 16and Ningmai 18under Super-high Yield Conditions

为给本地区超高产小麦品种的选育提供指导依据，对目前江苏淮南地区推广面积最大的小麦品种扬麦16和高产小麦新品种宁麦18（产量达8500 kg/hm2以上）的群体特征及株型指标进行研究。结果表明：高产群体花后干物质积累量与籽粒产量呈极显著正相关；叶面积系数（LAI）于孕穗期最大；叶片长表现为倒二叶＞倒三叶＞旗叶，宽表现为旗叶＞倒二叶＞倒三叶，倒二叶叶面积最大，倒二叶、倒三叶宽与产量呈显著负相关；节间配置为1∶2.5∶3.5∶（5～5.5）∶（8～9）。

In order to provide guidance for the selection of cultivars with super-high yield,the population characteristics and the plant type index of Yangmai 1 6 and Ningmai 1 8 are studied with the yield over 8 500 kg/hm2 .The results indicate that the accumulation amount of dry matter after anthesis and grain yield have significantly positive correlation;LAI is the biggest at booting stage;the leaf length is ranked as top 2nd leaf＆gt;top 3nd leaf＆gt;flag leaf;the leaf width is flag leaf＆gt;top 2nd leaf＆gt;top 3nd leaf;the area of top 2nd leaf is the biggest,and the widths of top 2nd leaf and top 3nd leaf and yield have significantly negative correlation;the ra-tio of internodes on the stem is 1∶2.5∶3.5∶（5~5.5）∶（8~9）.