棉花生长发育过程中,由于受内在因素和外界条件的共同作用,植株体内必然产生一系列有规律的生理变化和物质转化,并在外部形态上呈现相应的变化。叶片是棉株最主要的光合器官,是生长发育所需能量最重要的“源”,生理活动特别旺盛。所以“看叶诊断”对棉花生产具有重要的指导作用。棉花一生中,叶片的颜色发生着深(黑) During the process of cotton growth and development, due to the combination of internal factors and external conditions, a series of regular physiological changes and material transformation inevitably occur in plants, and corresponding changes are observed in the external morphology. Leaf is the most important photosynthetic organ of cotton plant, is the most important “source” of energy required for growth and development, particularly strong physiological activity. Therefore, “see leaf diagnosis” on cotton production has an important guiding role. Cotton’s life, the color of the leaves deep (black)