Effects of Planting Densities of Two Growth Type of Soybean Cultivars on the Vegetative Growth and Yield after Barley

맥후작(麥後作)에 있어서 신육형(伸育型)이 다른 대두(大豆)의 재식밀도(栽植密度)가 생육(生育) 및 수량(收量)에 미치는 영향(影響)

Two soybean cultivars different in plant type, Hwanggeumkong and Suweon-125, were planted under two different planting densities to investigate the proper planting densities after barley crops. The results obtained are summarized as follow: 1. No apparent varietal differences due to the planting densities were observed in flowering time and maturity. 2. The number of nodes of main stem showed significant differences between plant types, while they were not significantly different between planting densities. The number and length of branches per plant were apparently decreased as the planting densities were higher. 3. The number of pods per plant, and number and weight of grain per plant decreased as the planting densities increased and they showed also significant differences between planting densities. However, the number of pods, and number and weight of grain per unit land area were increased as the planting densities increased. 4. The grain yield per 10a showed significant cultivar difference under different planting densities. The Hwanggeumkong, determinate type, showed highest grain yield at the planting densities of $60{\times}7.5cm$, while Suweon-125, indeterminate type, highest at the planting densities of $60{\times}5.0cm$.

본(本) 실험(實驗)은 신육형(伸育型)이 다른 황금(黃金)콩과 수원(水原)125호(號)를 공시(供試)하여 맥후작(麥後作)에 있어서 알맞은 재식밀도(栽植密度)를 구명(究明)하고자 실시(實施)하였는데 그 얻어진 결과(結果)를 요약(要約)하면 다음과 같다. 1. 개화기(開花期)와 성숙기(成熟期)는 본(本) 실험(實驗)의 재식밀도간(栽植密度間)에는 차이(差異)가 없었다. 2. 주경절수(主莖節數)는 신육형간(伸育型間)에는 유의성(有意性)이 있었으나 재식밀도간(栽植密度間)에는 유의성(有意性)이 없었으며 밀식(密植)할수록 개체당(個體當) 분지수(分枝數)와 분지장(分枝長)은 현저(顯著)히 감소(減少)하였다. 3. 개체당(個體當) 협수((莢數), 입수(粒數) 및 자실중(子實重)은 밀식(密植)할수록 현저(顯著)히 감소(減少)하여 재식밀도간(栽植密度間)에 고도(高度)의 유의성(有意性)이 인정(認定)되었으나 단위면적당(單位面積當)으로는 밀식(密植)할수록 오히려 증가(增加)하였다. 4. 10a 당(當) 수량(收量)은 재식밀도간(栽植密度間)에 높은 유의성(有意性)이 인정(認定)되었는데 유한신육형(有限伸育型)인 황금(黃金)콩은 $60{\times}7.5cm$, 무한신육형(無限伸育型)인 수원(水原) 125호(號)는 $60{\times}5.0cm$에서 가장 많았다.