Causes of Bud and Boll shedding in planting Cotton

I. physiological shedding

Physiological shedding accounts for about 60-70% of the total shedding of buds and bolls, mainly due to improper management and diseases and insect pests, resulting in plant malnutrition and insufficient nutrition needed for bolls. There are mainly the following three aspects:

The main results are as follows: 1. The root system is underdeveloped, the water and nutrients are insufficient, the cotton plant is short and yellow, or the leaves produce less nutrients due to the damage of cotton aphid and red spider.

2. Improper density and management, aggravation of contradiction between population and individual, shade in cotton field, poor ventilation and light transmission, which affected the photosynthesis of leaves.

3. Vegetative growth and reproductive growth are out of balance, and vegetative growth is too prosperous, resulting in a serious lack of nutrition for vegetative organs, thus forming a "high sky".

2. Mechanical shedding

The buds and bolls fall off due to wind, hail, insect bites and mechanical damage in field management.

Third, no fertilization.

In the case of rain during flowering, it can not be fertilized, or when the temperature is higher than 36.5℃, the pollen grains are destroyed and fertilization is affected.

The main measures to reduce bud and boll shedding are as follows: timely prevention and control of diseases and insect pests, strengthening cultivation management, coordinating fertilizer and water supply, strictly preventing shading of cotton field, improving ventilation and light transmission condition of cotton field and so on.