ダイズの栽植密度による光受容の変化と生育・収量

日本作物学会紀事

中野 尚夫¹  大西 政夫¹  平田 清則¹ 

[1] 島根大学生物資源科学部

关键词: Planting density;    結莢率;    Podding rate;    栽植密度;    Yield;    子実収量;    Yield component;    収量構成要素;    Light intensity of node position;    節位相対照度;    Soybean;    ダイズ;    Survival rate of branches;    分枝生存率;    Branching percentage;    分枝発現率;   

DOI  :  10.1626/jcs.73.175

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The yield and yield components of soybean, cv. Tamahomare planted at six square densities (15cm × 15cm, 20cm × 20cm, 25cm × 25cm, 30cm × 30cm, 35cm × 35cm, and 40cm × 40cm) were examined in 1999. The dry weight of stems highly correlated with the number of branches (r=0.74**). The emergence rate and the survival rate of branches decreased as light intensity decreased when the relative intensity at the nodal position was less than about 35% and 10% of daylight, respectively, though they were constant when the light intensity was higher. Consequently, the number of branches and the dry weight of stems per plant decreased, and those per m2 increased gradually as planting density increased. The grain yield significantly correlated with the number of pods (r=0.71**). When the light intensity at each node position on the main axis was less than about 20% of daylight, the podding rate decreased as light intensity decreased, although it was constant when the light intensity was higher than about 20% of daylight. Consequently, podding rate decreased as the planting density increased. Mover, seed number per pod decreased as the planting density increased, although not significantly. These results suggested that the higher the planting density, the lower the pod number per plant due to reduction of branches and low podding rate, and the lower seed number per pod. Thus, the grain yield of soybean was lower when planting density was 15cm × 15cm or 20cm × 20cm than when planted at a density of 25cm × 25cm or 30cm × 30cm.

【 授权许可】

Unknown