How to top cotton

Cotton is an important textile raw material in our life. China is also a big cotton planting country in the world. To increase cotton yield during planting, topping is an important measure. Cotton topping can eliminate the growth advantage of cotton top, adjust the transportation direction of water and nutrients in the body, avoid nutrient consumption, and have obvious effect of increasing yield and income. So when is cotton topping good? And how do we do that? Let's take a look.

1. Top time

Topping time is very important. Topping too early will lead to strong growth of fruit branches on the upper part of the plant, which will easily lead to heavy concealment in the field and poor permeability, resulting in increased rotten bolls. Topping too late will lead to too many ineffective buds and delayed boll opening and maturity, and yield and quality will also be affected to a certain extent. Therefore, topping must be timely, from the plant growth, soil fertility status, top center and temperature and other factors to determine the topping time. Generally, it takes more than 80 days for buds to bloom from flowering to opening, and 80 - 90 days before the initial frost stage is the suitable period for topping.

2, topping method

In topping, one leaf and one heart at the top should be removed first, and different plots should be topped first, and then the plots with weak growth should be hit first. And the same piece of land topping, it is necessary to part of the size of one by one, it is best to finish the topping at one time, do not carry out in batches, do not miss plants. At this time, because the top is the concentrated belt of pests, so lay the top, can effectively reduce pests.

3. Control prosperity after topping

After topping, 1-2 times of vigorous control should be carried out. The first time of vigorous control should be carried out one week before and after topping. 4-5 g of mepiquat chloride can be diluted with 30 kg of water per mu and sprayed. In this way, ineffective buds can be well controlled, excessive buds can be reduced, plant shape can be molded and yield per mu can be increased. The second time is about one week after the first time. At this time, increase the dosage. Spray after diluting with 8-10 g of mepiquat amine mixed with 30 kg of water per mu. If the plant grows too vigorously, increase the dosage according to the actual situation.

4. Fertilizer and water management

After cotton topping, reasonable watering and fertilization should be carried out according to the growth of the plant. Generally, compound fertilizer should be applied according to 5-8 per mu. In addition, boron should be supplemented appropriately. 50 grams of water can be sprayed with 50 grams of water per mu. After topping cotton will soon enter the peak growth period of flowers, buds and bolls. This period is also the period when cotton needs the highest water, so it is necessary to water it in time after topping. Watering should be small enough water, not too much water at a time, but also according to the actual situation suitable for investment watering, so as not to cause greediness late ripening phenomenon, affecting yield.

The above is how to top cotton introduction, hope to help you, want to know more about the relevant knowledge, please pay attention to us.