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早稻移栽后,往往有部分秧苗发根缓慢,分蘖停滞,群众称为“发僵”,严重地影响了早稻的平衡高产。造成早稻发僵的原因是多方面的,综合起来有以下几点:(1)秧苗素质差生活力弱、发根力差,移栽后迟迟不返青,即使返青后发根也缓慢,分蘖停滞。(2)低温阴雨早稻移栽后如碰到低温多雨的天气,往往生长发育较慢,容易“发僵”。水稻分蘖最低气温是15～16℃,最低水温是16～17℃,若气温在20℃以下,水温在22℃以下,则分蘖显著延迟。水稻根系生长最低水温为12～15℃,如低于12℃时,根系生长停滞。
After the early rice transplanting, there are often some seedling hair roots slow, tiller stagnation, the masses known as the “stiff” seriously affected the balance of high-yielding early rice. There are many reasons for the stiff rice, including the following: (1) Poor quality of seedlings has weak vitality, poor hair rooting ability, delayed retreat after transplanting, even after turning green, the root is slow and the tiller Stagnation. (2) low temperature rainy morning after transplanting if encounter low temperature and rainy weather, often slow growth and development, easy to “stiff.” The minimum temperature of rice tillering is 15 ~ 16 ℃, the minimum temperature is 16 ~ 17 ℃, if the temperature is below 20 ℃, the water temperature below 22 ℃, the tiller significantly delayed. The minimum temperature for rice root growth is 12 ~ 15 ℃. If the temperature is lower than 12 ℃, the root growth is stagnant.