Varietal Difference and Temperature Response of Local Soil-Reduction around Germinating Rice Seed

Japanese Journal of Crop Science

Motoyuki HAGIWARA¹  Mitsuo IMURA¹ 

关键词: Direct sowing;    イネ;    Germination;    出芽;    Rice;    ç›´æ’­;    Seedling emergence;    土壌還元;    Soil reduction;    発芽;    Varietal difference.;    品種間差異.;   

DOI  :  10.1626/jcs.62.105

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Local soil-reduction occurs around rice seed when it is sown into flooded soil, and the reduction inhibits seedling emergence. Seedling emergence is more inhibited when the reduced soil area is formed earlier and becomes larger. Varietal difference and temperature response of local soil-reduction were investigated. Seed was exposed to local soil-reduction around it for a longer period before germination at 17°C than at 20°C. Although the reduction at 17°C proceeded about half as slow as that at 20°C, reduced area size around the time of germination at 17°C was not conspicuously smaller than at 20°C. Thus, the influence of reduction on seedling emergence was supposed to be stronger at lower temperature. This seemed to be closely related to the poor seedling emergence at low temperature. On the other hand, as germination percentage of each variety was much the same between 17°C and 20°C, it seemed to be less susceptible to local soil-reduction compared with seedling emergence percentage. Varietal difference was observed in the course of soil reduction around a seed ; however, neither positive correlation between reduced area size and germination percentage nor negative correlation between reduced area size and seedling emergence percentage were significant. Thus, it was suggested that not only reduced area size but also Eh and tolerance to soil reduction was concerned in the expression of varietal difference of seedling emergence.

【 授权许可】

Unknown