夏玉米产量与穗粒结构的关系分析

Studies on Relation of the Character of Spike and Grain to Yield in Summer Maize

分析76个夏玉米杂交组合在沿淮地区的产量与穗粒结构，结果表明；当667m2产量从279．60kg增加到358．33kg时，起主要作用的是千粒重；从358．33kg增加到443．40kg时，起主要作用的是行粒数；从443．40kg增加到530．43kg时，各性状均衡起作用，千粒重保持在300g以上水平。穗长、行粒数与产量相关极显著，千粒重与产量相关显著。通径分析结果表明：行粒数对产量的直接作用和决定程度最大，千粒重次之，再次为穗长。

The relations on the character of spike and grain to yield were analyzed by using 76 hybridized combinations of summer maize in Huai River basin of Anhui Province. The experimental results showed that the 1000-seed weight had a chief effect on yield at 279.60- 358. 33kg/m2, the grain per row played a main role to yield at 358.33-443. 40kg/667m2, and every character had an equal ef-fect on yield, while the 1000-seed weight was more than 300g at 443. 40- 530. 43kg/m2,The correlation between spike length and yield and correlation between grain per row and yield were significance at 0. 01 level, and the correlation between 1000-seed weight and yield was significance at 0. 05 level. According to the results of path analysis,the direct effect and the degree of determination on yield of spike and grain character arranged as follows. The grain per row was first, the 1000-seed weight second, and the Spike length the last.