Remedial measures after receiving cotton
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June 20 12:18:03, 2025
In the rainy season within cotton-growing regions, locust infestations are quite common, leading to varying degrees of damage. When cotton fields suffer from such disasters, the consequences range from slight wilting to complete destruction. Bolls, flowers, and buds fall off in large quantities, leaving the yield nearly nonexistent. To mitigate these effects, immediate and effective actions must be taken.
Firstly, loosening the soil around the cotton plants is essential. As soon as floodwaters recede from the fields, gently upright the fallen plants and stabilize them by firming up the soil. This not only ensures the plants grow upright but also enhances ventilation and sunlight exposure, significantly reducing losses from lodging. Once the soil becomes slightly dry, perform timely weeding to further improve aeration and support the healthy functioning of the root system.
Secondly, delaying the flowering process can be beneficial. After the initial flooding, the cotton tends to grow rapidly. By implementing remedial measures, you can delay the natural flowering period by approximately seven days. This allows for a longer growing season, providing an opportunity for more autumn fruits to set.
Thirdly, focusing on nurturing autumn fruits is crucial. Following a flood, the growth cycle of cotton is usually delayed. To compensate, apply fertilizer promptly to revitalize the plants. Mix 0.2-5% potassium dihydrogen phosphate with 2% urea at a rate of 50-75 kg per acre, or use a foliar spray of shibao or a 5-10 ml solution mixed with 40-50 kg of water. Repeat the foliar spray every 5-7 days until the cotton regains its vigor. Once normal growth resumes, apply 10-15 kg of urea per acre. Additionally, replenish any lost potassium by adding potassium sulfate (10 kg per acre) or plant ash (200-300 kg). These fertilizers will accelerate growth and encourage earlier fruiting, more bolls, and a delay in senescence.
Fourthly, pest control is vital. After flooding, cotton plants tend to have higher resilience and are more susceptible to pests like the fourth generation of cotton bollworms, small bridge pests, and cotton leafhoppers. From mid to late August, keep a close eye out for signs of infestation. If over 150 larvae are found in 100 plots, treat the area immediately with appropriate pesticides. For cotton bollworms, use a 50% cotton boll treasure solution diluted 1500-2000 times, or similar products like 40% A capoxin or 20% methomyl. To combat small bridge pests and cotton leafhoppers, apply 40% monocrotophos at a 1500-fold dilution. If boll rot sets in, spray a solution of Bordeaux mixture (0.8:0.8:100) at 800-1000 times the concentration.
Lastly, consider chemical ripening techniques. Due to the late emergence of cotton, harvesting largely depends on autumn fruits. Around early October, spray ethephon at a rate of 10-15 ml per acre mixed with 40-50 kg of water during sunny midday hours. This will hasten boll opening and maximize yields before frost.
By following these steps, farmers can minimize losses and ensure better yields despite adverse weather conditions.