１徒长徒长是苗生长中、后期常见的一种生理障碍。主要表现茎细弱、节间长、叶片薄、叶色淡绿、组织柔嫩。徒长苗移植后 ,对外界环境抗性差 ,缓苗慢 ,成活率低。由于育苗棚内温度过高、湿度过大、通风不良往往造成徒长 ,预防办法 ,一是增加光照强度 ,白天掀开覆盖物透光 ;阴雨 1 leggy growth is Miao growth, a common late physical disorder. The main performance stem thin, internodes, thin leaves, light green leaves, soft tissue. Only after the transplantation of long seedlings, the resistance to the external environment is poor, Huanmiao slow, low survival rate. As nursery studio temperature is too high, excessive humidity, poor ventilation often result in leggy, prevention methods, one is to increase the light intensity, open the cover during the day through the light; rain