Effects of Temperature on Rooting of Mat Rush Seedling

[摘要] Mat rush seedling has been generally transplanted in early winter (11∼5°C); it takes a relatively long days for striking root because of low temperature. Little was known about relationship between rooting ability of mat rush and temperature. In the privious paper, authors reported the relation between rooting ability under constant temperature. In this paper, authors report the effect of natural temperature on rooting of the seedlings from Oct. in 1966 to Feb. in '67. The results obtained are summarized as follows: 1. Number of roots newly emerged, length of roots newly elongated and rooting ratio (number of rooted seedlings/number of seedlings) after transplanting were investigated on the 7th day, 14th and 21st after transplanting. 2. Number and length of the roots and the rooting ratio were found to be increased rapidly in Oct. transplanting plot (20.5°C in soil temp.) and Nov. plot (15.3°C), slowly in Jan. plot (7.0°C), in Dec. plot (9.2°C) and Feb. plot (8.2°C) they were almost medium of those. 3. It was observed that the accumulated temperature of soil during 14 days after transplanting correlated with the number and the length of roots and the rooting ratio. 4. As the results, the practical low limit of the daily mean tenperature appeared to be about 7°C and the accumulated temperature for a fortnight to be above 100°C for rooting of the seedling.

[学科分类] 农业科学（综合）