Cotton planting technology: how to manage cotton flowering and boll period?

How to manage the cotton flowering and boll period? Please introduce the management methods of cotton flower and boll stage can refer to the following methods: 1. Fertilization: a large number of cotton peaches are formed in the flower and boll stage, which is the period in which cotton needs the most nutrients in its life. Re-application of flower and boll fertilizer is the key measure to protect summer peach, compete for autumn peach and prevent premature senility. The amount of topdressing should generally account for 50% or more of the total topdressing, and the time, quantity and methods of fertilization should be flexibly controlled according to factors such as climate, soil and cotton growth. If the weather is dry, base fertilizer, bud fertilizer is less, cotton plant growth is weak, boll fertilizer should be applied early and re-applied, so as to achieve "flower and boll application". If the weather is rainy, the bud fertilizer is applied more, the cotton plant is growing vigorously, and the boll fertilizer should be applied late. It is generally applied when 1-2 cotton peaches sit in the lower part of the cotton plant in full bloom, generally applying 10-13.3 kg of urea per mu, and 5-7 kg of potash fertilizer, ditching or deep application. In order to prevent cotton plants from premature senescence and multiple bolls, top fertilizer should be applied according to soil fertility and cotton plant appearance after full flowering. Generally speaking, 2.7-3.3 kg urea is applied per mu after cotton topping from the end of July to the beginning of August. If the bottom fertilizer is sufficient, soil fertilizer and cotton plants are flourishing, top fertilizer may not be applied. 2. Pruning: ⑴ smears superfluous buds. All the new buds growing at the base of the fruit branches and in the axils of the upper leaves of the fruit nodes are collectively called superfluous buds, which should be wiped with them to avoid wasting nutrients, causing shade and affecting the development of buds and bolls. ⑵ hit the top. Topping is the most important measure in the pruning technology of cotton field. Timely topping can break the top growth advantage of cotton plant, change the transport and distribution of nutrients in cotton plant, make it produce more buds and bolls, increase boll weight, and effectively control the height of cotton plant. improve ventilation and light transmission conditions, conducive to yield increase and early maturity. The time of topping is generally from late July to early August, only the top is removed, it is strictly forbidden to pull, and should be carried out in stages to make the growth of the whole field consistent. ⑶ is a bystander. The effect is similar to topping by removing the growing point of each fruit branch and controlling the lateral growth of the fruit branch. Generally, there are 2-4 fruit nodes in the lower fruit branch, 3-4 fruit nodes in the middle and 4-5 fruit nodes in the upper part. When the fruit branch reaches the planned fruit section, it will be removed. 3. Irrigation and drainage: the leaf area in the flower and boll stage is the largest, which coincides with the high temperature season, and the leaf transpiration is strong, which is the period when cotton plants need the most water in their life. when drought occurs and the soil is short of water, it will cause a large number of buds and bolls to fall off and cause premature senescence. Therefore, the flower and boll period must be watered and irrigated in time in case of drought. Generally, furrow irrigation is used, and the soil moisture should be preserved by ploughing in time after each watering. In addition, if Rain Water is too much, you should pay attention to drainage to avoid bud and bell falling off. 4. Middle tillage and soil cultivation: middle ploughing combined with topdressing at flower and boll stage can reduce grass damage, enhance soil permeability and prevent premature senescence of root system. The middle ploughing should be shallow rather than deep, so as not to hurt the roots too much, affecting the root absorption of water and fertilizer, resulting in bud and boll shedding. Soil cultivation can be combined with mid-tillage, which is beneficial to irrigation, drainage and lodging prevention. 5. Chemical control: chemical control depends on the growth and appearance of cotton plants. The chemical control with prosperous growth is increased appropriately, and the chemical control times and dosage are reduced when the growth is weak. Generally, 2-3 grams of 25% zhuangsu per mu is used in the full bud stage, 10-15 kg of water is sprayed once, 6-8 g of 25% zhuangsu is used per mu in the early flowering stage, and cotton seedlings are sprayed on 20-25 kg of water. About 7 days after topping (except for the early decaying field), the tip of the upper fruit branch of cotton branch was sprayed with 25% zhuangsu 12-20g per mu and 30-40kg of water. Click to get more cotton planting technology click to get more food crop planting technology