棉花要优质高产,培育壮苗是关键,因此,了解棉花的生长发育及其与环境条件的关系,有着重要意义。本文仅就棉花幼苗发育作一简要介绍。一、棉子的形态和构造1.外部形态棉子呈圆锥形,一头圆一头尖,长8—10毫米,宽5—6毫米,尖端有珠孔,宽端有合点。棉子外部有短绒的叫毛子,没有短绒的叫光子,一般常用的陆地棉是毛子,海岛棉为光子。短绒的颜色因品种而异,黑山棉1号为灰绿色,晋棉6号为灰褐色,鲁棉1号为灰白色。若白色棉子中有绿子出现为退化现象。种子大小,通常用子指(即百粒重)表示,我省棉区常用棉子百粒重为9— Cotton to high-quality and high yield, nurturing strong seedling is the key, therefore, to understand the cotton’s growth and development and its relationship with environmental conditions, is of great significance. This paper only on the development of cotton seedlings for a brief introduction. First, the shape and structure of cotton 1. The external shape of cotton was conical, a round tip, length 8-10 mm, width 5-6 mm, the tip of a beads, wide ends have a joint. Cotton linters outside the short hair called the hair, there is no short fiber called photons, the commonly used land cotton is the hair, island cotton as a photon. The color of linter varies by breed, Black Mountain Cotton 1 is gray-green, Jinmian 6 is gray-brown, and Lv Mian 1 is off-white. If the white cotton seed in a green phenomenon appears to degenerate. Seed size, usually with sub-means (that is, 100-weight) said that the province cotton area commonly used cotton 100-weight 9-