Prevention and control methods of premature senescence of cotton

Premature senescence of cotton refers to the premature cessation of photosynthesis during the growth period, which is older than that of normal plants in the weather. It has a serious impact on the yield of cotton, so how to prevent cotton premature senescence? Let's take a look.

1. Strengthen the management of fertilizer and water

Most of the causes of premature senility are caused by the lack of fertilizer and water in the later stage and plant malnutrition, so it is necessary to strengthen fertilizer and water management in the middle and later stage of plant growth, which can effectively control the early maturity of cotton planting. Generally speaking, when cotton enters the full bud stage to the early flowering stage, it is necessary to water in time, combined with watering and topdressing 8-10 kg of urea per mu, which can promote the flowering quality of the plant. If there is no application of base fertilizer, 10-15 kg of potash fertilizer should be applied. In the case of drought in the full flowering period, it is necessary to attack fertilizer and water, generally watering 1-2 times, and applying 8-10 kg urea per mu combined with watering can increase yield and prevent premature senility.

2. Uncover the film by ploughing.

In the flower bud stage of cotton, it is good to promote the growth and development of its root system, at this time, the plastic film has lost its use of heat preservation and moisture conservation, on the contrary, the high temperature under the film will affect the root development. Therefore, in this period, it is necessary to uncover the film in time, cut off part of the lateral roots, promote the root system to root down, increase the ability of drought and waterlogging resistance, and play the role of strong seedlings. Generally, 2-3 times of intertillage should be carried out, and the depth of each intertillage increases with the growth of the root system.

3. Pruning and topping

Fuqian peach will affect the growth and development of plants, resulting in poor root growth, and Fuqian peach happens to be in a high-temperature and high-humidity environment, which is prone to rotten peach. Therefore, it is best to remove the lower 1-2 fruit branches or 2-3 bolls of the lower fruit branches, in order to make full use of time and space to make more bolls. At the same time, to do a good job of topping, generally medium fertility cotton field topping in mid-July, delayed to late July at the latest, can reduce plant nutrient consumption.

4. Spraying foliar fertilizer

Cotton enters the late growth stage from August to September, when the root system's ability to absorb nutrients decreases, and it is easy to appear premature senescence. Therefore, at this stage, 0.2 kg of urea + 0.3 kg of potassium dihydrogen phosphate + 30 kg of water can be used for foliar fertilizer spraying, which can prevent premature senility and achieve obvious effect of increasing production and income.

The above is the introduction of cotton premature senescence prevention and control methods, hope to help you, want to know more related knowledge, please pay attention to us.