Effects of shading at various stages of flowering time on the yield-determining process in autumn type soybeans

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  • 開花期前後の遮光が秋ダイズの収量成立に及ぼす影響
  • カイカキ ゼンゴ ノ シャコウ ガ アキ ダイズ ノ シュウリョウ セイリツ

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To obtain some informations about the relationships between the dry matter production and the yield-determining process, soybean plants, cultivar "Akiyoshi", were submitted to two levels of shading conditions at various stages of growth, especially at flowering time. As the shading treatments were started earlier and the degree of those became heavier, the height of the plant became higher and the branching and the dry matter production were more restricted. After the treatments, however, the remarkable recovery was recognized with the branching and the dry matter production. The seed yield was reduced by all treatments, showing that this reduction was responsible mostly for the reduction of the numbers of fertile pod and seed per plant. Of these two yield components, the former was directly correlated with the dry matter production at flowering time.

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