Early loss of nitrogen by leaf pruning during ripening period reduced yield of larger soybean seeds

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  • 窒素の視点からみた登熟期間の剪葉処理がダイズの百粒重および子実重に及ぼす影響
  • チッソ ノ シテン カラ ミタ トウジュクキカン ノ センヨウ ショリ ガ ダイズ ノ ヒャクツブジュウ オヨビ シジツジュウ ニ オヨボス エイキョウ

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Abstract

To analyze the influence of early leaf fall during the ripening period of soybean on yield and 100-grain weight, we pruned leaf blades and petioles at 20, 15, and 10 days before maturity (DBM) in 2004, and at 20, 15, and 9 DBM in 2006. The nitrogen contents of the leaves decreased in the order of 20, 15, and 10/9 DBM. In contrast, those of stems, pods, and seeds at maturity decreased in the order of control (no pruning), 10/9, 15, and 20 DBM. Consequently, the total nitrogen content (pruned leaf blades, petioles, stems, pods, seeds) did not change. The yield and number of seeds 5.5-7.3 mm long decreased in the order of 20, 15, 10/9 DBM, and control. In contrast, those of seeds >7.9 mm long increased in that order. The 100-grain weight showed different tendencies between years. Consequently, increasing the loss of nitrogen favored the production of smaller seeds over larger seeds.

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