论文部分内容阅读
一、苗期三类苗的产生与转化壮苗是棉花高产的基础。苗期由于外界环境条件的影响,加上有的栽培管理不当,往往出现不同类型的三类苗,这就是棉花高产的障碍因子。做好三类苗的转化工作,促进平衡生长,是棉花高产中必须解决的问题。(一)三类苗的体症1.根系不发达:不发根、少根、黄根、黑根、烂根2.生长速度慢:主茎叶日增量平均在0.3厘米左右,出叶速度慢,花芽分化慢、现蕾晚。
First, seedling emergence and transformation of three types of seedlings Strong seedling cotton is the basis for high yield. Seedling due to external environmental conditions, coupled with some inappropriate cultivation and management, there are often three types of seedlings of different types, which is the obstacle to high yield of cotton. The transformation of the three types of seedlings should be well done and the balanced growth should be promoted. This is a problem that must be solved in cotton production. (A) three kinds of seedling disease 1. Underdeveloped root system: no hair roots, fewer roots, yellow roots, black roots, rotten roots 2. Slow growth: the main stems and leaves an average daily gain of about 0.3 cm, the leaves Slow, slow bud differentiation, late budding.