Comparison of Yield in Korean Small Seed Soybean Cultivars with Main Stem and Branch Production

Abstract

showed the highest value by 7.6, and followed by that of 3,~, 1=: and over 4, branch in this order. The seed yield varied from 168 tb 289g' m~' and the average of all soybean cultivars w~s 225g m~'. The relation beiween the seed yield and th~ days'of flOwering to maturing date was high significant difference (r=0.575, p<0.01) and there ~vas a high significance difference (r= 0.781, p<0.01) between the seed yield and the days of planting to flowering date. The level of significant difference was higher in the period of vegetative s~age than in th~ Period of reproductive stage in small seed soybeans. Thefe was high significance difference (r=0.55e, p<0.01) betweeh th~ seed yi~ld and LAI in soybean cultivars. A range of LAI fdr optimal sded yield may be shown about 3.5-4.5 at R5 stage. Also, there was a relationship betweeh the seed yield and the number of pods on 4, and above branch but was no sighificant relationship' between the seed yield and number of pods on Ist branch. The correlation between the seed yield and the pods numbers showed the most value by 0.640 (p<0.01) on 3.* branch, and followed 2 branch, and 4' and above branch in this order. There was a high significant relationship (r= 0.648, p< 0.01) between the seed yield and the number of pods on total branch aitlong 22 small seed soybean cultivais. However, the relation between the seed yield and the number of pods on main stem showed no significant relatidnship (r=0.089, ns). These results indicated that in order to optimal seed yield of late planted (mid~une) small seed soybean, soybean cultiyars forrning more pods, on the 2 and 3,* branch should be bred.