異なる生育時期の冷水掛け流し処理が湛水直播水稲の出芽と苗立ちに及ぼす影響

日本作物学会紀事

田中 英彦¹  山崎 信弘¹ 

[1] 北海道立上川農業試験場

关键词: 出芽;    水稲;    湛水直播;    低温;    苗立ち;    冷水灌漑;    Cool water irrigation;    Emergence;    Low temperature;    Paddy rice;    Seedling establishment;    Submerged direct-seeding;   

DOI  :  10.1626/jcs.85.241

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

A field experiment was conducted in the paddy field in which cool water (about 11ºC) was continuously irrigated, to determine the most low-temperature-sensitive stage of submerged direct-seeded paddy rice seedlings. Cool water treatments were given from just after seeding (JAS), full emergence stage (FES), and second leaf appearing stage (SLA), for 7 and 14 days. Seeds were sown in plastic nursery boxes used for seedling raising. Each treatment was carried out by moving the nursery boxes from the normal field to the cooling field at the starting stage. Average water temperature in each cooling treatment was below 12ºC. Percentage of seedling establishment was lowest in FES, followed by SLA. Leaf age just before and after the cooling was also examined to find the factors that decrease establishment percentage in each treatment. The decrease in seedling establishment in JAS mainly resulted from the decrease in emergence percentage, but that in FES and SLA mainly resulted from the failure of first leaf elongation, and also from the failure to survive after the first leaf elongation in SLA. These results indicate that the stage of seedlings most sensitive to low temperature is just before the first leaf elongation, in other words, the elongation stage of coleoptile.

【 授权许可】

Unknown