First, the choice of cotton fields. Need to ripen the cotton, mainly cotton development late, a large proportion of autumn peaches, greedy green late, bolling late waiting to pick the firewood field, if no ripening will affect the pods sowing, but for the early decay cotton, yellow Thin cotton or cotton bolls that are relatively concentrated cannot be ripened. Because the cotton bolls are precocious, they also play the role of early fall of the leaf. Second, several criteria should be mastered for ripening cotton with ethephon. 1, the effective ring age of the drug. Most of the cotton bolls matured with ethephon must be in the safe and effective bell period for more than 45 days. Bell age is not enough, spray ethephon, will crush the young bell caused by reduced production. Too many peaches in autumn and autumn, especially if there are more peaches in late autumn, the plots with big difference in the age of bells, it is better to spray ethephon in stages, spray the middle and lower bolls firstly, and then spray them for three days or so. Cotton bolls are better. 2, medication time. Generally 15 days to 20 days before the frost. Spraying should pay attention to the master: choose sunny and warm weather, the maximum daily temperature of 20 degrees Celsius, ethephon can play a role quickly. Below 20 degrees Celsius the weather application effect is poor, so pay attention to the weather forecast before application, it is best to choose the application of drugs can have 3 days to 5 days of high temperature above 20 degrees Celsius in order to give full play to the best efficacy, generally 7 days visible With the ripening effect, concentrated boll opening peaks occurred in 10 days to 15 days. 3, the appropriate application amount and concentration. In general mu 40% ethephon 100 ml ~ 150 ml, water 40 kg ~ 50 kg, spraying in the cotton plant with a bell. The medicine was evenly applied to the boll and the cotton boll was dehydrated. Do not spray only the cotton leaf, usually spray it once. For late-maturing, late-growth cotton fields, it is best to prune first, then spray, in order to improve efficacy. Third, pay attention to matters. 1, rainfall within 6 hours after spraying, need to re-spray. 2. Pick up the spit-bubble bell before spraying, and the cotton boll that boils after spraying can no longer be used as seed cotton. 3, ethephon solution is an acidic solution, pH value will change after dilution with water, so to be used with the mix, should not be long-term, can not be mixed with alkaline pesticides. China Agricultural Network Editor
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