冷水灌漑が水稲高温登熟障害発生軽減に及ぼす影響

日本作物学会紀事

大関 文恵¹  小林 朋子¹  和田 義春¹  粂川 春樹¹ 

[1] 宇都宮大学農学部

关键词: Breeding rate;    出液速度;    Chalky kernel;    白未熟粒;    Cool water irrigation;    冷水灌漑;    High temperature stress;    高温登熟障害;    Rice;    水稲;    Root activity;    根の生理活性;    Soil temperature;    地温;   

DOI  :  10.1626/jcs.82.360

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

In order to mitigate the reduction of grain quality of rice by a high temperature during the ripening period of rice, the effects of irrigation with cool water was investigated. Field experiments were conducted using rice cultivar Koshihikari. Grain yield and apparent grain quality were examined under different air and soil temperatures regimes. Air temperature was changed by transplanting on different dates and soil temperature by setting the experimental plots at different distances from a cool water inlet. More chalky kernels, such as white back and basal white kernels, were found under a higher air temperature condition during 20 days after anthesis. The occurrence of these chalky kernels was reduced by irrigation with cool water. A significant correlation was found between the occurrence of chalky kernels and the average soil temperature during 20 days before anthesis, suggesting that a low soil temperature improved root activity and decreased the number of chalky kernels. In pot experiments, irrigation with cool water (17°C) reduced the occurrence of milky white kernels under high air temperatures to 2% compared to the 14% in the control by preventing the reduction of root activity and delaying leaf senescence.

【 授权许可】

Unknown