水稲直播栽培における出芽に関する研究 : 第5報籾の湿潤・高温処理による中茎の伸長促進と出芽

概要

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In this study, effect of high temperature treatment of seeds before sowing on the emergence in paddy rice seedlings were examined. Materials were two paddy rice varieties "Koshijiwase" and "Hoyoku" in japonica type, and cultural temperature was about 20℃. Seeding-depth were 5 and 7cm, and soil moisture content was about 19 per cent (pF value was about 3). The following results were obtained. 1. High temperature treatment of seeds before sowing promoted the emergence in rice seedlings. The promotion was more obvious under the conditions of 5 cm or more depth of seeding and compacted covering soil. 2. The most effective high temperature treatment of seeds before sowing was as follows. (i) Moisture content in seeds before the high temperature treatment; 24-27 per cent. (ii) Volume of vessel in which contains seeds during the high temperature treaument; 4-40 times larger than the volume of seeds. (iii) High temperature treatment; 4-8 days at 40-44℃.
日本作物学会の論文
1972-03-28