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Observe the growth of cotton bolls and apply the cotton flowering and boll fertilizer precisely
In the middle and late stages of cotton growth, flowering and boll fertilizer should be applied accurately according to changes in bolls and leaf color. Generally, where soil fertility is good, seedling and bud fertilizer is plentiful, growth during the bud and flowering stage is vigorous, leaves are large, leaf color is deep, internodes are sparse, bracts do not tightly enclose the flower buds, few bolls are set, and leaf color does not fade at early flowering, flowering and boll fertilizer in such cotton fields should not be applied early; it should be postponed until bolls increase and leaf color turns lighter. Conversely, where soil fertility is poor, seedling and bud fertilizer is applied in small amounts, growth during the bud and flowering stage is weak, leaves are small, leaf color is light, internodes are short and thin, bract color is light, flower buds are few, and leaf color is pale yellow at early flowering, 5-8 kg of urea per mu can be applied as a relay fertilizer
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