Ethephon ripening cotton technology
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1. Pharmacodynamics. Ethephon on the market mainly consists of two kinds of water and oil. No matter which one is used, it should be checked for failure before use. A small amount of the original drug can be poured on the concrete floor, and the foaming is more effective. If the chemical liquid produces a precipitate, it can be heated and shaken with warm water of 70-80 ° C, and the precipitate is dissolved and used, without affecting the efficacy.
2. Pharmacological. Ethylene is acidic, and it will rapidly decompose and fail in the presence of alkaline substances. Therefore, ethephon is strictly prohibited from being mixed with alkaline pesticides, and it cannot be diluted with alkaline water such as pit pond water. Ethylene can release ethylene gas at pH 3.8 or higher. After dilution with water, the pH value will change, so it should be used with it, otherwise it will affect the efficacy.
3. Select the plot. It is necessary to choose cotton fields and summer cotton fields that are greedy, late-maturing, late-developing, and intercropping. It is not suitable for cotton fields with normal growth and development and premature aging. Otherwise, cotton will prematurely wither and lead to reduced yield. For the breeding of good varieties, it is generally not used, otherwise it will lead to a decrease in the germination rate of cotton.
4. Time of application. Ethephon must be decomposed to release ethylene in an environment above 20 °C, and drying high temperature weather is beneficial to improve the efficacy. Therefore, it is generally mastered that 20 days before the frost, 80% cotton hangs for 40 to 45 days, and when the maximum temperature is above 20 °C, it is sprayed. If it rains within 12 hours after spraying, it should be sprayed once. The Huanghuai sponge area was best sprayed around October 5.
5. Application concentration. Generally, the cotton field is used with 100-150 grams of stock solution plus 60 kilograms of water, and is formulated into a 0.15% to 0.25% liquid spray. For cotton fields that are heavily greedy or eager to vacate, the concentration can be increased, but generally does not exceed 0.3%.
6. Spray method. The cotton field that is late-maturing or cotton-growing, only one spray on the upper bell is too large, and can be sprayed twice. That is, the middle and lower cotton bolls of the cotton plant are sprayed in the middle and late September, and the top cotton boll is sprayed once more in the first half of October. Since the ethephon is absorbed and the transport is slow, it should be sprayed on the boll as much as possible. It should be noted that the bolled cotton bolls should be removed before spraying to avoid contamination of the liquid and reduce the quality of the cotton.
Source: Hebei Farmers Daily