水稲の短期直播栽培に関する研究 : VI. 晩期栽培における播種期の早晩が生育収量に及ぼす影響

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概要

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• This experiment was carried out in order to make clear the relation of the sowing time to plant growth and rice yields in the late seasonal cultivation. Varieties used for this experiment were Yukara (extremely short-term variety) and Fujiminori (short-term variety). Seeds were sown at six times from late June to early August. The authors tested the growth and yields affected by variations in sowing time. The results are summarized as follows: 1) Grain yields decreased with the delay in sowing time. It was explained that the reduction in yields was caused by decrease in the dry matter accumulation in panicles and in the ripening grade (the weight of 1,000 kernels x the percentage of ripened grains). 2) The decrease in dry matter accumulation in panicles with the delay in sowing time was due to the reduction in the rate of dry matter production during the ripening period. The reduction in the rate of dry matter production during the ripening period was due to the decrease in the net assimilation rate and the amount of leaves, and affected equally by the decrease in the net assimilation rate in the case of Yukara and by the decrease in the net assimilation and the amount of leaves in the case of Fujiminori, respectively. 3) There were no grain yields when the heading time was so late (Fujiminori, sown on 8 August) as ripening was completely disturbed by unfavourable weather conditions. The decrease in grain yields with the delay in sowing time in Fujiminori was greater than in Yukara. 4) The decrease in ripening degree caused by the delay in sowing time was due to the lowered ratio of the quantity of dry matter accumulation in panicles to the number of hulls per unit area. Namely, it was due to the fact that the decrease in the quantity of dry matter accumulation in panicles per unit area was greater than the decrease in the number of hulls per unit area.

• 日本作物学会の論文
• 1968-09-10

著者

• 小松 良行

  農林省四国農業試験場

• 升尾 洋一郎

  農林省四国農業試験場

• 石倉 教光

  農林省四国農業試験場

• 升尾 洋一郎

  農林省四国農業試験場:(現)農林省北海道農業試験場

関連論文

• 稚苗移植による水稲晩期栽培法に関する研究 : 第1報 晩期栽培における椎苗移植の晩限と品種選定
• 生籾の一時貯留に関する研究 : 第3報 コンバイン収穫籾の貯留性について
• 生籾の一時貯留に関する研究 : 第2報 水稲収穫時期の違いが貯留性に及ぼす影響
• 純同化率の季節的変化が水稲の生育に及ぼす影響
• 水稲の短期直播栽培に関する研究 : VII. 品種の早晩と収量との関係 (第146回講演会)
• 水稲における純同化率の季節的変化
• 水稲の短期直播栽培に関する研究 : V. 出穂期の窒素追肥が収量に及ぼす影響
• 生籾の一時貯留に関する研究 : 第1報 籾水分ならびに貯留温度が籾の変質に及ぼす影響
• 水稲の短期直播栽培に関する研究 : VI. 晩期栽培における播種期の早晩が生育収量に及ぼす影響
• 亜麻の自然交雑について

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