Reapply Hua-Bing fertilizer to ensure proper nutrient supply, which helps in managing the cotton crop more effectively later on. When removing the plastic film during flowering, it's important to immediately apply top-dressing fertilizer. In times of drought, make sure to water the crops promptly. Using plastic film and transplanting seedlings is common practice. During early flowering, re-apply fertilizer (known as flower-heavy fertilization), which should account for roughly half of the total top-dressing amount. For live cotton, apply full bloom fertilizer (peach-heavy fertilization). Early spring cotton tends to grow quickly, so to prevent premature aging, you can apply an additional top-dressing about 10 days after applying the flower-bell fertilizer. A typical application is around 5 kilograms of urea per mu.
If there's a drought or insufficient watering, the cotton will enter the flowering stage but may not be drought-resistant. Drought or water stress often leads to a large number of buds falling off. The soil moisture content in the cotton field should ideally be between 20-40 cm. If the moisture level drops below 60% of the field's water-holding capacity, irrigation is necessary. Watering should be done at a rate of 30-40 cubic meters per mu to maintain optimal conditions.
The cotton bolling period occurs during the hot and rainy season, making the field prone to compaction. Timely cultivation helps loosen the soil and stimulate root activity. The depth of cultivation should not be too deep—around 6-7 cm is ideal to avoid damaging the roots while still improving soil aeration.
It's important to manage the growth of the cotton plants properly. During the early flowering stage, spray 2 grams of methamidophos or 25% helper factor at 8 ml per acre. When the cotton is in full bloom, increase the dosage to 3 grams of salicylamine or 25% helper factor at 12 ml per acre. This ensures steady and healthy plant development without excessive vegetative growth.
Timely topping is essential for high-yield cotton fields. Topping should generally be done between July 15th and 20th. For late-developing or vigorously growing cotton, topping should occur before July 25th. If topping is done too early, it may result in fewer effective branches and axillary bud clusters, with long upper fruiting branches that hinder air circulation and reduce boll retention. On the other hand, if topping is delayed, it can lead to empty upper branches and lower bolls dropping, both of which negatively affect yield.
During the flowering and boll formation stages, common pests include Fuxi and the third generation of Helicoverpa armigera. The infestation rate of Fuxi can reach up to 5%, and the resistance of cotton bollworms to certain pesticides can be as high as 5% among newly hatched larvae. Monitoring and timely pest control are crucial to protect the crop and ensure a good harvest.
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