Cotton is currently entering the boll-opening stage, and proper management is essential to promote early maturity, prevent premature aging, increase boll weight, boost the number of bolls, avoid rotting, and accelerate boll opening to ensure a high yield. Effective care during this period plays a critical role in maximizing both quality and productivity. One important practice is foliar fertilization to prevent early aging. As August progresses, the root absorption capacity of cotton plants tends to decline. In areas where the soil is nutrient-deficient or the fields are barren, foliar sprays can be used to supplement essential nutrients and reduce the risk of early aging. A 1-1.2% urea solution, mixed with 600 times diluted organic potassium (rich in potassium), 1000 times diluted boron, and 0.3% zinc sulfate, can be applied at a rate of 50-60 kg per mu. This mixture can also be combined with pest control agents for added benefit. Spraying should be done every 7-10 days, repeating the process 3-4 times for optimal results. Pest and disease control is another key aspect. In the later stages, common diseases include yellow wilt and red stem blight. Yellow wilt can be managed using potassium permanganate or a higher concentration of carbendazim. For red stem blight, applying foliar organic potassium fertilizer helps suppress its development. Regarding pests, focus should be on controlling the fourth generation of bollworms and other boll-feeding insects. Pesticides such as 20% methomyl, 35% Shuodan, or 25% cyhalothrin are effective options for application. Pruning is also necessary to improve light penetration and air circulation. Begin by removing yellow and old leaves from the main stems starting around late August. Then, promptly eliminate axillary buds and ineffective buds from the tips of branches. This process should be carried out several times, especially on lower and middle fruit branches where empty bolls may appear. Additionally, for fields that are overly shaded due to excessive rain, it's recommended to push and mound the plants 2-3 times, spaced 5-7 days apart. This improves airflow and light exposure, helping to prevent mold and promote healthy boll opening. For damaged or rotten bolls caused by rain, it’s advisable to pick the mature bolls on the lower branches early. Using 40% ethephon at a concentration of 150-200 g per 50 kg of water can help speed up ripening. For late-maturing varieties, if more than 80% of the bolls have been open for over 45 days, choose three consecutive sunny days with temperatures above 20°C to apply the same ethephon solution, focusing on the middle and lower bolls. Finally, timely harvesting is crucial. The best time to pick cotton is when the bolls have cracked and opened, with high fiber strength, white color, and full maturity. Harvesting too early or too late can negatively affect the quality and grading of the cotton. Any rotten or diseased bolls should be removed immediately and taken out of the field. Regularly picking and sunning the remaining bolls helps reduce the spread of pathogens and maintains overall crop health. By following these practices, farmers can significantly enhance the yield and quality of their cotton harvest.

Color Doppler

Color Doppler,Color Doppler Ultrasound Scanner,Full Digital Ultrasound Scanner,Color Doppler Ultrasound Machine

CHANGZHOU RICHGENIUS MEDLAB CO.,LTD , https://www.rich-gen.com