In the whole growth period of cotton, there is a clear trend of lesser, more, and less dynamic changes in the fertilizer requirement for the whole growing period. That is, the emergence of buds (the period from May 1 to June 10) is small; the buds are blooming (from June 10 to June 7). On the 5th of the month, the demand for fertilizer increased rapidly; the flowering boll (from July 5 to the end of August) required fertilization to reach the highest peak; the boll opening and one harvest (after the end of August) gradually decreased again. The main points of cotton dressing are determined according to the law of fertilizer requirement in the life of cotton:
Light, partial or no Miaojiang cotton into the growing season, intense competition between the plants nutrients, weak seedlings are easy to compete for nutrients and not bud, flowering phenomenon, so the cultivation of strong seedlings is the basis for high yield. In the case of a sufficient amount of Ba, when the emergence of seedlings is neat, the seedlings can be applied neatly or not; if the seedlings are high, short, strong, and weak, the short- and weak-seedlings must be applied in a partial manner to promote strong growth and seize high yields.
After applying budding cotton buds, buds began to appear, and the amount of fertilizer needed to increase rapidly. Nitrogen fertilizer should be topdressed to supplement nutrient deficiencies. It is not advisable to pay attention to the time when topdressing nitrogenous fertilizer. It should be carried out during Shenglei period.
Replanting buds, fertilizers, and applying a-pa time at 7 to 10 days after flowering, sitting on a bell with a diameter of 2 cm or more (July 15 to 20), applying 10-15 kilograms of urea, and promoting the lower part of plants. Peach grows.
Apply top dressing fertilizer In early August, cotton enters the boll opening period, and the growth volume gradually weakens. The appropriate amount of top dressing fertilizer during this period can serve the upper autumn peach, and it can also improve the quality of autumn peach. Mu recovery urea 3 ~ 5 kg, combined with pest control can be foliar spray fertilizer.
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