Cotton topdressing has a coup

During the whole growth period, it is obvious that there is more than one less-less dynamic change law, that is, the emergence of a seedling bud (May 1 to June 10) is less; the bud is blooming (June 10 to 7) On the 5th of the month, the fertilizer needs to grow rapidly; the flowering one (the July 5th to the end of August) needs the fertilizer to reach the peak; the vomiting harvest (after the end of August) is gradually reduced. According to the law of cotton in the life of cotton, the main points of cotton topdressing are identified:

Light, partial or no seedling fertilizer: cotton enters the peak period of growth, the nutrient competition between plants is strong, weak seedlings can easily compete for nutrients and emerge as buds and flowering scenes. Therefore, cultivating strong seedlings is the basis of harvest. When the base is full and the emergence is uniform, the seedlings can be applied lightly or not; when the seedlings are high, short, strong, and weak, the short and weak seedlings should be biased to promote the weak and strong, and to obtain high yield.

Steady application of bud fertilizer: After the cotton is budd, the fruit branches appear at the beginning, and the fertilizer needs to grow rapidly. The nitrogen fertilizer should be properly applied to make up for the lack of nutrients. It is not advisable to pay attention to the time when applying nitrogen fertilizer. It should be carried out in the Shenglei period.

Reapply flower bud fertilizer: Shiba time control is 7-10 days after flowering, when a bell with a diameter of 2 cm or more is sitting in the lower part (July 15-20), and 10-15 kg of urea is applied in the mu to enhance the plant. The lower peach grows.

Replenishing the topping fertilizer: In the first ten days of August, the cotton enters the boll opening period, and the growth amount is gradually weakened. In this period, the appropriate amount of the topping fertilizer can serve the upper autumn peach, and at the same time, the quality of the autumn peach cotton can be improved. The grain of urea is 3-5 kg, and the joint treatment of insects can be used for foliar spray fertilizer.