平均気温と気温日較差が寒冷地における湛水直播水稲の出芽・苗立ちに及ぼす影響

日本作物学会紀事

原 嘉隆¹  古畑 昌巳² 

[1] 農研機構九州沖縄農業研究センター;農研機構中央農業総合研究センター北陸研究センター

关键词: Arrhenius equation;    アレニウス式;    Cold climate area;    寒冷地;    Daily temperature range;    気温日較差;    Direct seeding in flooded paddy field;    湛水直播;    Rice;    イネ;    Seedling emergence;    出芽;   

DOI  :  10.1626/jcs.83.203

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

In the Hokuriku region, direct seeding tends to be more common in inland areas than in coastal areas. One reason may be the sea breeze in coastal areas, which can delay or suppress the rise in daytime air temperature. In addition, seedling emergence and the early growth of direct-seeded rice in the coastal area may be influenced by the narrow daily temperature range between daytime and nighttime, even if the mean daily temperature is the same as in the inland areas. In this study, the growth of potted plants in a windbreak plot was compared with that in a non-windbreak plot (control) under outdoor conditions. In the windbreak plot, in which the maximum temperature was high and the daily temperature range was wide, the seedling emergence and establishment rates were higher than those in the control plot. We also investigated seedling emergence and establishment of direct-seeded rice grown under different mean air temperatures and daily temperature ranges using germinated seeds in a temperature-controlled incubator. Our results indicated that the influence of the daily temperature range after seeding was greater under low-temperature conditions than under high-temperature conditions. Under low-temperature conditions, early growth was better with a wide daily temperature range than with a narrow daily temperature range. Moreover, the change with time in the measured value of seedling emergence rate and that estimated by the Arrhenius equation were approximately the same.

【 授权许可】

Unknown