Cotton: Proper management can reduce boll shedding

There are three main reasons for cotton bud and boll shedding.

First, physiological shedding is also the main cause of shedding. Due to the mutual influence of meteorological and nutritional conditions, cotton plants suffer from metabolic disorders, lack of nutrition, and physiological shedding of buds and bolls.

Second, adverse weather conditions aggravate the harm of diseases and insect pests. Cotton aphids, red spiders and other pests bite leaves, resulting in decreased photosynthetic capacity of leaves, resulting in malnourishment of buds and bolls, increased shedding, excessive spraying, high liquid concentration, and short spraying time intervals. It will also increase the shedding rate of buds and bolls.

Third, the mechanical damage caused by strong wind and hail also led to the increase of bud and boll shedding. In the unfavorable weather conditions, the lack of light in the field is the most important influencing factor. Due to the large degree of shading in the bud stage, the light intensity in the middle and lower part of the cotton field decreases rapidly, the light compensation point can not be reached, the photosynthesis can not be carried out normally, and the accumulation of nutrients is less. the lower bud boll fell off due to insufficient nutrients.

Main measures to reduce bud and boll shedding:

First, excellent varieties with stable growth, strong boll setting, strong resistance and low shedding rate should be selected, which is the basis for reducing bud and boll shedding.

The second is to carry out reasonable fertilizer and water management, control and promote the combination of drainage and irrigation, improve soil fertility, promote the absorption capacity of cotton roots, and ensure the absorption and supply of nutrients.

Third, after the closure, the field management should be strengthened, the old leaves should be forked and wiped off in time, the field is well ventilated and transparent, and the photosynthesis of the middle and lower leaves can be carried out normally.

Fourth, find out the law of the occurrence of diseases and insect pests, according to the scientific guidance of agricultural plant protection departments, according to different types of diseases and insect pests, different periods of occurrence, adopt comprehensive technology for prevention and control, but also pay special attention to the prevention of drug pests, protect natural enemies, and protect the ecological environment of cotton fields.

Fifth, scientific chemical regulation, spraying growth regulators such as thalidomide and auxin, controlling plants and dwarfing plant types can improve field light conditions, coordinate plant nutrition distribution and reduce bud and boll shedding.