Effects of Soil Temperatures on the Rooting of Cut-sprouts of Sweet Potato (Ipomoea batatas Lam.) : II. Varietal differences in the optimum soil temperature for rooting and the rooting ability under the low soil temperature

Japanese Journal of Crop Science

Michitaka KOMEICHI¹  Atsushi OYANAGI¹  Yasushi WATANABE¹  Makoto NAKATANI¹ 

关键词: Cut-sprout;    サツマイモ;    Low temperature;    地温;    Optimum temperature;    低温;    Rooting;    適温;    Soil temperature;    è‹—;    Sweet potato;    発根;    Varietal difference;    品種間差異;   

DOI  :  10.1626/jcs.58.35

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The varietal differences in the optimum soil temperature for rooting and the rooting ability under the low soil temperature were investigated under the controlled environment (air temperature: 25/16°C, soil moisture: 70% of field capacity). The optimum soil temperature for the total root length at 1 week after transplanting was about 30°C in 8 cultivars. In another cultivars, i.e. Kokei 14, Norin 2, Tamayutaka and Benikomachi, it was about 35°C. Thus the optimum soil temperature for the establishment of cut-sprouts seems to be higher in these 4 cultivars. In all cultivars the optimum soil temperature was higher than 29°C. The ratio of the total root length under 18°C to that under 28°C, differed among cultivars, and it was higher in Norin 1, Minamiyutaka, Kokei 14 and Benikomachi and lower in Tamayutaka, Norin 2, Shiroyutaka and Shirosatsuma. The total root length per unit weight of cut-sprouts under the critical soil temperature, 15°C, also differed among cultivars. It was higher in Norin 1 and Minamiyutaka, and it was lower in Benikomachi and Kokei 14 etc. Thus it seems that the rooting ability under low soil temperatures is higher in Minamiyutaka and Norin 1.

【 授权许可】

Unknown