The latest time and method of cotton topping

If cotton wants to increase production, topping is the focus of cotton pruning work. Topping can eliminate the top growth advantage of cotton, adjust the transport direction of water and nutrients in the body, and promote the improvement of yield and quality. So when will the cotton be topped? How to hit the top? Let's get to know it.

1. Topping time

Generally speaking, the normal topping time of cotton is about 90 days before frost, and the effect of topping too early and late is not good. There are three standards in the scientific period of cotton topping. The first is that the top and top leaves of the cotton plant hold normally; the second is that the plant height reaches 60 cm; and the third is to bear 8-12 fetal fruits. Around mid-July. The sign of early topping is that the top of the cotton plant is 1-2 lower than the top, and the sign of topping too late is when the top of the cotton plant is higher than the top two leaves. The topping time should also be flexibly mastered according to the actual situation of the cotton field and the weather, and the topping should be appropriate according to the actual situation.

2. Topping method

When cotton is topped, one leaf should be removed from the top, and different plots should be topped first, and then cotton fields with strong growth should be hit; the same cotton field should be topped one by one, regardless of size, not in batches, nor should it be missed. It is necessary to control prosperity after topping, and it is generally necessary to control prosperity for 1-2 times after topping. For cotton with weak growth, high planting density, poor fertilizer and water, and flowering to the top, it can be controlled within 5-7 days; the second prosperity control is generally carried out moderately after the first medication, and if the cotton growth is too prosperous, the dosage can be appropriately increased during the second time.

3. Topdressing after topping

Cotton topdressing should be appropriate according to the growth situation after topping. Generally speaking, ordinary cotton fields can apply 5-8 kg of ternary compound fertilizer per mu. In saline-alkali land, 3-5 kg of ternary compound fertilizer can be applied per mu. In addition, boron fertilizer should be properly applied after topdressing. After 50 grams of borax is melted in warm water, 50 kilograms of water can be sprayed on one mu of cotton field to supplement boron for the plant, increase the number of bolls, and achieve the effect of increasing yield.

4. Watering after topping

Generally speaking, cotton will enter the peak period of flower, bud and boll growth soon after topping, which is the peak of water demand during the whole cotton growth period, and sufficient watering should be required after topping. Watering should be small enough to avoid excessive watering, late watering should be stopped according to the growth of cotton, so as to avoid late greed and late maturity of cotton.

The above is the introduction of cotton topping time and methods, hope to help you, want to know more related knowledge, please follow us.