Causes and control methods of cotton stiff seedlings

With the cotton planting area getting larger and larger, but accompanied by more and more problems, cotton rigid seedlings is one of them, which seriously affects the output and quality of cotton and brings huge economic losses to growers. So what are the causes and symptoms of rigid cotton seedlings? How to prevent and cure it? Let's take a look.

1. Temperature and moisture

When transplanting, it is usually in May, when the temperature changes, the temperature is high and rainy, and the temperature difference between day and night is large. Cotton is very easy to lose water when it grows, and if it is not replenished in time, it will lead to rigid seedlings. In addition, the transplanting temperature is 12 degrees low. It will freeze the roots, stems and leaves of the plant, resulting in slow growth or stop growing, forming rigid seedlings.

Prevention and control methods: sowing time is reasonable and appropriate, transplanting time to avoid changeable climate as far as possible, if the climate is not suitable, can postpone transplanting time, in addition, after transplanting to maintain the water needed for plant growth, timely watering, but in rainy weather to do a good job of drainage and waterlogging prevention measures, when the temperature is low, by covering rice straw or plastic film to increase soil temperature, fertilization is also a way to prevent low temperature damage to the root system.

2. Improper fertilization

The application of base fertilizer is relatively shallow, resulting in direct contact between the root system of the plant and the fertilizer, and the thick fertilizer will lead to damage to the plant, resulting in root burning, or failure to cover the soil in time and not watering after fertilization, resulting in slow decomposition of fertilizer. in the event of heavy rain, it will cause fertilizer damage to the plant, resulting in rigid seedlings. In general, the greater the application of base fertilizer, the earlier the rain after transplanting, the bigger Rain Water, and the more serious the rigid seedlings of the plant, but also accompanied by some physiological disease symptoms.

Prevention and control methods: the application of base fertilizer should not be excessive, the base fertilizer must go deep into the soil layer, and a layer of soil should be added to prevent the root system from coming into direct contact with fertilizer. Each topdressing can be adjusted into thin fertilizer water with water, which can also accelerate the absorption of plants.

3. Poor quality of cotton seedlings and transplanting.

In raising seedlings, due to improper management, resulting in poor quality of seedlings, many weak seedlings and diseased seedlings, far lower than normal seedlings, resulting in a very low survival rate when transplanting, even after survival is also very easy to seedling. In addition, due to poor soil preparation during transplanting, too deep or too shallow when transplanting, lax soil sealing and so on, the seedlings will grow weakly or atrophy not long, resulting in rigid seedlings.

Control methods: must be carried out strictly when raising seedlings, regardless of the selection of seedling bed, soil selection and seedling bed management, to meet the necessary conditions for seedling growth as far as possible. When transplanting seedlings, do not lose the seedlings, especially the rhizome, remove the weak seedlings and diseased seedlings, transplant is not deep or shallow, cover the soil compacted and buried.

4. Diseases and insect pests

After transplanting, due to soil and management reasons, the plant will be disturbed by diseases and insect pests, and rigid seedlings will be formed. Such as Fusarium wilt, anthracnose, Fusarium wilt, thrips, cotton aphids and other diseases and insect pests, will make the plant leaves curly, root growth weak, plant dwarf, the formation of rigid seedlings.

Prevention and control methods: do not be careless in the prevention and control of diseases and insect pests, give priority to prevention, and timely treatment should be made when diseases and insect pests are found. After treatment, topdressing urea 30-50kg per mu and spraying potassium dihydrogen phosphate solution per mu can promote its rehabilitation.

The above are the causes and control methods of rigid cotton seedlings. I hope I can help you. If you want to know more about cotton planting, please follow us.