보리 早熟 多收性 品種育成 硏究 Ⅱ. 收量構成要素의 品種間 差異

Studies on breeding for early and high yielding barley varieties Ⅱ. Varietal difference in yield components

To obtain the information of selection index for early maturing varieties of barley with high yield, 2 maturing groups which have 25 different varieties were applied. In early maturing group, the heritability of heading date was highest, and that maturing date, 1000 grain weight, grains per spike, spikes per ㎡ and grain yield were the next higher ones in order. But in late maturing group, this order was very similar to early group one except 1000 grains weight. On the point of correlationship between characteristics related with grain yield, in the early maturing group, there were positive correlationship between earliness and grains per spike, grain yield, while negative correlationship was there with spikes per ㎡. In the late maturing group, even if heading date and maturing date were high positive correlationship with grains per spike and with spikes per ㎡, there were negative correlationship between spikes per ㎡ and grains per spike. On the path-coefficient analysis, direct effect of grains per spike to grain yield was highest, in the early maturing varieties of yield components, while the one of 1,000 grain weight on grain yield was highest in the late ones.