棉花高产受环境和栽培条件的制约,在生产中往往会产生不同类型的苗情,对这些异常棉苗产生的原因,根据本人多年的试验和调查,进行了分析,以便采取针对性的措施,促进高产。一、出苗期缺苗型产生的原因1.种子质量不高种子不饱满——出苗不全。弱苗易病;种子带病菌——发病烂种死苗。土里丧命(霉烂),或者出苗后发病死苗;不成熟的种子,受潮变质的种子——发芽率低,或不发芽。2.温度过低或过高盲目早播、温度不够——不出苗;寒潮侵袭——易病易死苗;播种过迟遇上高温——由于呼吸作用极为旺盛,胚内代谢产物一时不能排除,容易对胚细胞产生毒害、阻碍正常生长,甚至引起死亡,使发芽率低。3.水分过多或过少 Cotton yield by the environment and cultivation conditions, often in the production of different types of seedlings, the reasons for these abnormal cotton seedlings, according to my years of tests and surveys conducted in order to take targeted measures, Promote high yield. First, the seedling seedling causes of the emergence of 1. Seed quality is not high seed is not full - sprouting incomplete. Weak seedlings disease; seeds with germs - the incidence of dead seedlings. Soil dies (mildew), or disease occurs after emergence of seedlings; immature seeds, damp seeds - germination rate is low, or no germination. 2. The temperature is too low or too high blind early sowing, the temperature is not enough - not sprouting; cold wave invasion - easy disease easy to seedlings; sowing late encounter high temperatures - due to extremely strong respiration, embryo metabolites can not be excluded , Easy to poison the embryo cells, hinder the normal growth, and even cause death, so that the germination rate is low. 3. too much or too little water