The fundamental measure for preventing premature aging of cotton is to start by strengthening the basic construction of cotton fields, that is, deep plowing of cotton fields, application of organic fertilizers, and maintaining the balance of various elements in the soil. When cotton enters the later period of fertility, only the following remedial measures can be taken:
First, fertilizer and water management should be based on the cotton plant conditions, climate and conditions to re-apply flower bell fertilizer, such as flower bell and fertilizer shortage, and then make cover top fertilizer. After entering mid-August, if the maximum water holding capacity in the field is less than 60%, and if it falls below 55% in the first half of September, timely watering should be conducted to promote fertilizer with water to ensure that the fertilizer effect is played in time. For example, due to soil potassium deficiency caused by premature aging of cotton, at the same time in the base fertilizer, potassium sulfate or potassium chloride 5 to 10 kg in the seedling stage. When fertilizing, it is necessary to plunge more than 20 cm deep and apply the fertilizer to the bottom of the plough so that the fertilizer can be applied deeply, roots can be pulled down, fertilizer loss can be reduced, and fertilizer utilization can be increased. Flowering During the period of bell-ringing, we must pour small water in case of drought, carefully clean up the ditch to prevent further water damage;
Second, rational control In order to prevent early onset of plants and the formation of premature aging, should be combined with weather, fertility, looks, comprehensive consideration of chemical control time and the amount of helper prime, which is the most important thing. Usually in the 8-leaf stage, bud stage, early flowering stage, full flowering stage, and after topping a small number of multiple spray Zhuang Ti Ling and other regulators, in order to achieve a reasonable regulation and control purposes.
Third, outside the root dressing After August, for phosphorus-deficient, potassium-deficient cotton fields, can be sprayed once every 10-15 days 300-500 times the potassium dihydrogen phosphate solution, 60 to 80 kg per acre spray fertilizer. For nitrogen-deficient cotton fields, 200 times urea 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. After the rain has been removed, for the cotton fields that have not been closed, especially in the hilly areas, the compaction shall be removed in time. The loose soil should not be too deep so as not to damage the root system and destroy the soil. It is also possible to spray the soil conditioner "free from deep plowing". Spraying “without deep plowing†can break the compaction, loosen the soil, and improve the soil structure; it can fully exert the fertilizer effect, promote the normal growth of the root system, and increase the root absorption capacity. Spray the method of “no deep plowingâ€: 200 ml per mu watered 50 kg, evenly sprayed on the earth.
Fifth, topping pruning First, we must timely fine pruning, removal of invalid buds, buds after the beginning of autumn or after the white dew to remove all the flowers in order to reduce consumption. Second, for the lower fruit branches to keep fruit festivals, the first and second fruit branches to stay in 1 section, the third and fourth fruit branches to stay in 2 sections, the festival is long enough to play early after the heart. This approach can save organic nutrients and prevent premature aging of cotton.
6. The functional period of the normal leaf of the insect-protected and leaf-protecting leaves is generally about 8 weeks. However, due to the insect pests such as cotton bollworm, blind stink bug, red spider and other diseases such as wilt disease, verticillium wilt, and red leaf blight, the blades are damaged or fall off. Reduce the function of the blade and accelerate premature aging. Therefore, we must control insect pests, reduce disease, and extend the function of the leaves. In the initial stage of Verticillium wilt, can be used 40% carbendazim 1000 times Irrigation (0.5 kg / strain), or with 500 times the fulvic acid plus a new high-fat membrane mixture spray control.
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