Physiological studies of the growing process of broad bean plants. XI. Effects of amounts of fertilizer, especially P applications on the growth and the seed production

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  • 蚕豆の生育過程に関する生理学的研究 Ⅺ. 施肥量，とくにリン酸の施用量が生育ならびに子実生産に及ぼす影響について
  • 蚕豆の生育過程に関する生理学的研究-11-施肥量,とくにリン酸の施用量が生育ならびに子実生産に及ぼす影響について
  • ソラマメ ノ セイイク カテイ ニ カンスル セイリガクテキ ケンキュウ 11

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Abstract

The effects of amounts of fertilizer, the ratio of applying P to N and K on the growth, and the dry matter production and its distribution to the vegetative and reproductive organs of broad bean plants were studied, using the cultivar "Sanuki-nagasaya" as material. The experiment was conducted with six treatments of NPK (Standard), O, NK, N3PK, 3NP3K, and 3N3P3K. The vegetative growth including the development of root nodules and reproductive growth were clearly promoted by dressing of P. Similar results were found with plants receiving much N and K on the development of huge vegetative organs, but the reproductive growth was disturbed. The contents of three elements in vegetative organs were generally high throughout the vigorous growing period especially in the early to flowering period and that of K was directly high responding to the amount of dressing. And though the amounts of three elements increased after the flowering period, the accumulations of N and P behaved as same as dry matters, different from those of K. The correlation between the maximum amounts of N and P storing in the vegetative organs and seed yields were significant, especially with P. Judging from the results, it may be pointed out that the active P content in the plant is stable and function as the limitting factor for the use of N and K elements despite absorbing excess doses in the broad bean plant.

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