夏植菜引起秧苗徒长的原因,主要是光照不足和温度过高,尤其是夜间温度过高,呼吸消耗过多时更易发生。此外,氮肥和水分过多、播种过密、移苗不及时等也容易引起秧苗徒长。在夏植菜育苗期间均可能出现徒长,但各个时期出现徒长的原因是不同的:①最可能发生徒长,并造成严重 Summer vegetable seedlings cause leggy growth mainly due to insufficient light and temperature is too high, especially at night over temperature, excessive consumption of more prone to occur. In addition, too much nitrogen and water, sowing too close, not timely transfer of seedlings also easily lead to the growth of seedlings. During summer nursery growth may be leggy, but the growth of leggy during different periods are different: ① the most likely to be leggy and cause serious