On the relation between dry matter production and plant density in autumn type soybeans

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  • 秋ダイズにおける乾物生産と栽植密度との関係
  • アキ ダイズ ニ オケル カンブツ セイサン ト サイショク ミツド ト ノ

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The present experiment was carried out to obtain some information about the yield-determining process in soybean plants concerning with dry matter production under three plant densities, using the autumn type variety "Akiyoshi" as material. The three plant densities conducted were 'low'(3.3/㎡), 'medium'(6.6/㎡), and 'high'(13.2/㎡) under field conditions. With increase in plant density, dry weight of each organ, numbers of branches, total nodes, leaves, pods and seeds per plant decreased, but the results per sq. meter were generally contrary to the results per plant. Though the productive structures in three plant densities showed the type of broad leaf plants, vertical distribution of photosynthetic system was restricted in upper portion with progress in growth stage and with increase in plant density, showing a close relation to the light distribution within canopies. Of the various yield components, the number of total pods and the ratio of fertile/total pods might be dependent on dry matter production at the vegetative growing stage and the early maturing stage, respectively. Judging from these results, it appears that 'high' density in this experiment may be a limit beyond which further increase in plant density will not increase the seed yield.

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