What are the key management techniques for the boll-opening stage of cotton?
How should cotton be managed during the boll-opening stage? Please advise. During the boll-opening stage, cotton can be managed by referring to the following methods: 1. Skillfully manage fertilizer and water to promote nutrient translocation. First, foliar feeding. For cotton fields where leaves lose green too early and show premature aging from nutrient deficiency, spray 50-60 kg per mu of a 1%-2% urea solution onto the leaves to extend the functional period of the leaves. For cotton fields that grow too vigorously and show late maturity with excessive vegetative growth, foliar spray of a 0.2% potassium dihydrogen phosphate solution or a 0.3% superphosphate soaking solution can be used to promote nutrient translocation and help improve boll opening. Second, prevent autumn drought.
How should cotton be managed during the boll-opening stage? Please advise.
During the boll-opening stage, cotton can be managed by referring to the following methods:
1. Skillfully manage fertilizer and water to promote nutrient translocation. First, foliar feeding. For cotton fields where leaves lose green too early and show premature aging from nutrient deficiency, spray 50-60 kg per mu of a 1%-2% urea solution onto the leaves to extend the functional period of the leaves. For cotton fields that grow too vigorously and show late maturity with excessive vegetative growth, foliar spray of a 0.2% potassium dihydrogen phosphate solution or a 0.3% superphosphate soaking solution can promote nutrient translocation and help improve boll opening. Second, prevent autumn drought.
2. Skillfully prune branches and push plants together to promote maturity. Limited by temperature, generally buds appearing after the "Start of Autumn" and flowers after White Dew are ineffective. The newly grown tender parts of the cotton plant should be removed in time, which not only saves nutrients but also reduces damage from the fourth generation of cotton bollworm. In seriously closed cotton fields, due to poor ventilation, some excess old leaves can be removed on the premise of keeping one cotton boll for every 3-5 cotton leaves. Plants can also be pushed together and ridges combined, that is, two adjacent rows of cotton plants are brought together in a V shape, and after 5-7 days, they are pushed apart to both sides again.
3. Skillfully pick rotten bolls to improve quality. Dip the picked cotton bolls in a 1% ethephon solution and then dry them in the sun to obtain cotton with better boll opening.
4. Skillfully time ripening to advance boll opening. Spraying ethephon at the appropriate time can make cotton open bolls about 10 days earlier and increase the pre-frost lint rate by 20%-30%. During spraying, it should be ensured that the bolls on the upper part of the cotton plant have grown for more than 40 days and that there are about 20 days before the killing frost. The spraying amount is generally 150 grams of 40% ethephon per mu, diluted with 50-100 times clean water, and sprayed evenly. If spraying is early, the temperature is high, and the cotton plants are weak, about 100 grams per mu can be sprayed. If rain occurs 6 hours after spraying, re-spraying is needed (note that seed-production fields should not be sprayed).
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