This year, the Langfang area of ​​Hebei Province was dry and rainy in spring, and many cotton farmers did not dare to control it. Some cotton fields have not yet been subjected to the first chemical control, and most of them have problems of late chemical control and small dose. In the principle of mastering the principle of “seeing the sky, seeing the ground, and seeing the seedlingsâ€, it should be based on “seeing the seedlingsâ€. As long as the cotton seedlings grow at a normal speed, they must be controlled on time. This is called “ Active control, if it is re-controlled after prosperous, it is "passive control."
According to the previous situation of chemical control and the current cotton growth, it is generally controlled 2 to 3 times, the first time in the initial flowering period, 1~1.5 grams of amiamine used in the mu; the second time in the flowering period, 1~2 grams of medicine in the acre After the third time, after the topping, the medicine used was 3~5 grams. Due to the large cotton plant, the whole plant should be sprayed with 20~25 kg of water per acre, and the tip and middle and upper fruit branches are sprayed.
The problem of cotton fertilization is the most complicated problem in cotton management. It is not the more fertilization and the higher the yield. Sometimes improper fertilization will lead to the opposite result. On the basis of applying the base fertilizer, it is generally not necessary to apply quick-acting nitrogen fertilizer before flowering and ringing, to avoid excessive vegetative body or excessive vegetative growth; topdressing should be at the flowering stage (the fourth fruit branch is flowering), visual field and plant growth Apply 10~15 kg of urea per mu; if the bottom fertilizer is not applied with potassium fertilizer or the amount of potassium fertilizer is too small, it should be applied as soon as possible.
After the cotton is topped, the nutrient is given priority to the young bell, and the upper fruit branch is in the most easily de-fertilized state. At this time, the top dressing is not only difficult, but also restricted by the dry land. The foliar spray fertilizer should be used to ensure the required nutrition of the cotton plant. Foliar spray fertilizer not only saves fertilizer, but also has a quick effect on fertilizer.
Urea and potassium sulphate are the best choices: one is high in nutrient content, the other is low cost, and the third is safe to use. The concentration of spray fertilizer is 2%. Use more than 1 kg of fertilizer per mu. Avoid spraying at noon. Be sure to spray the back of the cotton leaf. Spray immediately after topping, 8 to 10 days. The principle of cotton topdressing is not to overdo it before flowering, and do not remove fertilizer after flowering.
This article URL: Cotton chemical control and topdressing
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