What are the key management considerations for the late stage of cotton cultivation?
What should be noted in the late stage of cotton cultivation? Please give an introduction. In the late stage of cotton cultivation, the following points should be noted: Pay attention to drainage. When cotton is in the full flowering and boll-setting stage, rainfall is heavy, sunlight is scarce, and field water-holding capacity is basically saturated. Keeping cotton field drainage unobstructed and preventing waterlogging is particularly critical. Water appropriately. After the Beginning of Autumn, ...
What should be noted in the late stage of cotton cultivation? Please give an introduction.
In the late stage of cotton cultivation, the following points should be noted:
Pay attention to drainage. When cotton is in the full flowering and boll-setting stage, rainfall is heavy, sunlight is scarce, and field water-holding capacity is basically saturated. Keeping cotton field drainage unobstructed and preventing waterlogging is particularly critical.
Water appropriately. After the Beginning of Autumn, drought is often severe. From mid-August to mid-September, the soil moisture content in the 0-40 cm layer should remain above 55% of field water-holding capacity. If it falls below this level, water lightly or water every other row. Never flood-irrigate or soak the field.
Intertill and loosen the soil. After rain or irrigation, the cotton field surface becomes compacted, permeability is poor, and root activity declines. Shallow intertilling with animal power or hoeing by hand can be used. At this time, damage to fruit branches and bolls is minimal. Loosening the soil should be shallow rather than deep.
Foliar topdressing. Heavy rainfall can cause fertilizer loss, so foliar topdressing can supplement nutrients. Specific method: starting from the flowering and boll stage, per 667 sq m use 150-200 g of potassium dihydrogen phosphate, 10 mL of Lüheng Biduoshou, 100 g of borax, 100 g of zinc sulfate, and 400 g of urea, mix with 50 kg of water, stir thoroughly, and spray once every 10-15 days for a total of 2-3 sprays. On sunny days, spray after 4 p.m.; on cloudy days, it can be done all day. Never spray when the temperature is high and light is strong, to avoid excessive water evaporation after spraying, which causes a sudden increase in concentration and leaf burn.
Top and prune promptly. When cotton enters the bud stage, properly remove 4-5 early buds from the first and second layers of fruit branches to encourage early formation of a high-yield structure and concentrated boll setting. Remove the terminal bud before the Beginning of Autumn, and promptly remove superfluous buds after topping. Due to sufficient water and removal of the terminal bud, side shoots and leaf branches grow quickly, so pruning should be done promptly to promote the conversion of nutrients toward reproductive growth and achieve the goal of preserving young bolls and increasing boll weight.
Scientifically control pests. Cotton aphids, cotton bollworms, and other pests have strong pesticide resistance. When controlling them, pay attention to mixed and rotated pesticide use. Commonly used pesticides include: 2.5% deltamethrin emulsifiable concentrate at 1000x dilution; 50% methyl parathion 1605 emulsifiable concentrate at 1000x with Bt formulation at 200x; 50% monocrotophos at 1500x with 20% fenvalerate at 2000x for spray control.
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