Effect of seed soaked with urea solution on the cold tolerance of rice seedlings

摘要

In the Yangtze river aera, the first crop of indi-ca rice is sown in late Mar to early Apr and transplanted in early May. Usually, seedlings perish when abnormal low temperature of 6 -10°C lasted for 3 d or longer. The effect of socking seed with urea solution on increasing the cold tolerance at the seedling stage was studied.