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Cotton topping must be done at the right time and promptly; seizing the moment is key
Cotton has an indeterminate growth habit. Under certain temperature conditions, the terminal bud keeps growing and extending, and continuously differentiates new stems, leaves and fruiting branches. Topping is the manual removal of the terminal bud so that it no longer produces new fruiting branches, allowing the vast majority of bolls to open before frost. Therefore, this is a key operation for artificially regulating the cotton growth period. Before topping, the cotton plant has apical dominance, with water and nutrients supplied preferentially to the terminal bud; after topping, they are supplied preferentially to the organs growing and developing fastest. It can thus be seen that topping affects the transport and distribution of nutrients in the cotton plant, so
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