二、棉花的营养生长一粒小小的棉籽长成棉株,吐出洁白的棉絮,需要有营养器官根、茎.叶在生长过程中负担起吸收、输送、制造、分配和积累养分的作用,为生殖生长打下基础。下面谈谈棉花这些营养器官的生长规律。1.根的生长棉花是深根作物,它的根可分为主根、侧根和支根,主根上分生出侧根。侧根又有支根。在这些根的尖端幼嫩部分又生有根毛,这就组成了棉花的圆锥 Second, the vegetative growth of cotton A small cottonseed grow into cotton plants, spit out the white cotton, need to have vegetative organs, stems and leaves in the growth process to absorb, transport, manufacture, distribution and accumulation of nutrients, Lay the foundation for reproductive growth. Here to talk about the growth of cotton vegetative organs. 1. Roots growth Cotton is a deep-rooted crop, its roots can be divided into main root, lateral root and branch root, the main root points on the lateral root. There are roots of lateral roots. In the tender tip of these roots, there is root hair again, which forms the cone of cotton