Effects of Temperature on the Growth of Rice Nursling Seedlings in a Nursery Chamber

Japanese Journal of Crop Science

Mitsuo SAITO¹  Yusuke GOTO¹ 

关键词: Changing temperature;    育苗温度;    Cumulated temperature;    草丈;    Nursling seedling;    出芽器内育苗;    Raising of seedling in nursery chamber;    水稲;    Raising temperature;    積算温度;    Rice plant;    乳苗;    Seedling length;    変温;   

DOI  :  10.1626/jcs.67.284

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The effects of temperature on the growth of rice nursling seedlings in a nursery chamber were investigated to clarify the standard growth of nursling seedlings. Rice cultivar Sasanishiki seeds with buds 0.3∼1.0mm long were sown on a culture medium of granulated soil. In order to keep the temperature of the culture medium accurate, the medium was warmed with water in a nursery chamber before seeding. The seedlings were raised in nursery chambers kept at 3 constant temperatures (31°C, H plot;28°C, M plot;and 25°C, L plot) and 2 changing temperatures (25°C-2days to 31°C, L2H plot;and 25°C-3days to 31°C, L3H plot) under wet and dark conditions. The growth rate of plant length increased with increasing temperatrue. In the H plot, the plant length reached 7 cm 4 days after seeding, which is a suitable size required for the transplanting machine. In the same cumulated average temperature after seeding (CAT), plant length was longer when subjected to high temperature as compared to low temperature, and the leaf emergence rate was faster under high temperature.The above results make it clear that it is not suitable to compare the growth of nursling seedlings raised under different temperatures using only CAT. After changing temperature, the growth pattern of the plant lengths in the L2H and L3H plots were nearly equal to that in the H plot. Therefore, it was suggested that the nursling seedlings were not damaged by the low temperature for 2 and 3 days immediately after seeding.

【 授权许可】

Unknown