Remedial measures after receiving cotton
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June 20 11:49:01, 2025
In the rainy season in cotton-growing regions, locust plagues are quite common, ranging from mild to severe. When cotton suffers significant damage, its condition can range from being slightly bent to completely destroyed, leaving plants either severely weakened or dead. This leads to a massive shedding of buds, flowers, and bolls, resulting in an almost total loss of the crop's productive capacity. To mitigate these losses, timely and effective countermeasures must be implemented.
Firstly, loosening the soil around the cotton plants is crucial. As soon as the flooded fields drain, any fallen plants should be carefully propped up and stabilized. This helps ensure the plants grow upright again, improving air circulation and sunlight exposure within the field. Additionally, once the soil becomes slightly dry, it’s important to loosen the soil further to enhance aeration and encourage healthy root development. This step not only reduces losses from lodging but also promotes the overall vitality of the cotton plants.
Secondly, delaying the flowering process can be beneficial. After the initial flooding, the cotton may experience a rapid growth spurt due to corrective measures. By postponing the flowering phase by approximately seven days, you allow for more autumn fruiting, which can significantly boost yield.
Thirdly, focusing on autumn fruiting is essential. Once the cotton has been affected, its growth cycle is usually delayed. Applying fertilizer at this stage is vital to revitalize the plants. Mix 0.2-5% potassium dihydrogen phosphate with 2% urea solution, applying 50-75 kg per acre, or use a solution of shibao mixed with 5-10 ml of foliar spray diluted in 40-50 kg of water. The first application should occur 5-7 days after the initial treatment. Once the plants regain their vigor, apply 10-15 kg of urea per acre. For fields that have experienced flooding, potassium losses should be replenished using potassium sulfate (10 kg per acre) or plant ash (200-300 kg). These supplements help accelerate plant growth and promote early fruiting, ensuring robust yields.
Fourthly, pest control is critical. Following flooding, cotton plants tend to be more resilient and youthful, making them susceptible to pests such as the fourth generation of cotton bollworms, small bridge pests, and cotton leafhoppers. From mid to late August, vigilance is key. If more than 150 larvae of the second instar or higher are found in over 100 field plots, immediate pesticide application is necessary. For cotton bollworm control, options include 50% cotton boll treasure, 40% A capoxin, or 20% methomyl diluted 1500-2000 times. Small bridge pests and leafhoppers can be managed with a 40% monocrotophos solution diluted 1500 times. In cases of boll rot, a Bordeaux solution (0.8:0.8:100) diluted 800-1000 times with carbendazim suspension should be sprayed promptly.
Lastly, chemical ripening can be employed in early October. Using ethephon at a rate of 10-15 ml per acre mixed with 40-50 liters of water, spray during sunny afternoons to encourage earlier boll opening, maximizing yield before frost.
These measures, when executed diligently, can help restore the health and productivity of cotton fields, even after severe flooding.