The reason why cotton has emerged in late-age decline is that after cotton grows into August, roots, stems, leaves, and bells compete for organic nutrients, resulting in imbalances in supply and demand of nutrients; the external cause is cotton fields. Late water and fertilizer deficiencies, such as: phosphorus deficiency or potassium deficiency, there are also some cotton fields because of the excessive number of late spraying, drug concentration is too high, causing serious damage to cotton leaves.
The fundamental measure for preventing premature aging of cotton is to strengthen basic construction. When cotton enters the later period of fertility, only some remedial measures can be taken:
1, fertilizer and water management. According to the seedlings, climate and land conditions, the flowers and bells should be reused, such as the shortage of flowers and bells. After entering mid-August, the maximum water holding capacity in the field is less than 60%. When the water level in the field is lower than 55% in early September, timely watering should be conducted to promote fertilizer with water to ensure that the fertilizer effect is played in time. If the soil is deficient in potassium due to premature aging of cotton, it should be applied at the same time as potassium sulfate or potassium chloride 5 to 10 kg. Fertilization must be deep plowing more than 20 cm, the fertilizer applied to the plow at the end, do deeper fertilizer, promote root bar, reduce fertilizer loss, improve fertilizer utilization. During the flowering and boll season, when it is dry and water is small, clean up the ditch to prevent it from receiving water stains again.
2, rational control. In order to prevent premature aging of plants, it should be combined with weather, fertility, long-term, comprehensive consideration of control time and the amount of auxogens, usually at the 8-leaf stage, bud stage, early flowering stage, full flowering stage, and topping Spraying auxin and other regulators to achieve reasonable control.
3, outside the top dressing. After August, for phosphorus-deficient and potassium-deficient cotton fields, a 300-500-fold solution of potassium dihydrogen phosphate may be sprayed once every 10-15 days, 60-80 kg per mu. For nitrogen-deficient cotton fields, 200 times urea solution can be sprayed. Outside the root dressing, cloudy days can be sprayed, sunny days should be sprayed in the evening, so as not to burn the leaves.
4, break the knot. After the rain, for cotton fields that have not been enclosed, especially in the hilly areas, the soil should be shredded in shallow soil in time, and the loose soil must not be too deep so as not to damage the root system and destroy the soil. If you do not want to loose soil, you can spray the soil conditioner "to avoid deep plowing" to loosen the soil, improve soil structure, promote normal root growth, and increase root absorption capacity.
5, topping pruning. Timely fine pruning, removal of ineffective buds, buds after the beginning of the autumn or after the white dew all the flowers removed to reduce consumption. On the lower fruit branches, fruit festivals should be kept low. The first and second fruit branches should be left in one section, and the third and fourth fruit branches should be left in two sections. This approach can save organic nutrients and prevent premature aging of cotton.
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, insect protection leaves. The functional period of normal leaves is generally about 8 weeks, but due to the effects of pests such as cotton bollworm, blind stink bug, red spider, etc., and yellow wilt disease, red leaf blight, etc., the blades are damaged or fall off and accelerate premature aging. Therefore, the control of pests and diseases is very important for extending the function of leaves.
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