How to use ethephon to ripen cotton?

How to use ethephon to ripen cotton? Ethephon can accelerate boll ripening by 7~10 days, increase yield by 6.4%~10.2% and increase income by 26~40 yuan per mu. However, the following points should be noted when using: 1. Efficacy. There are two main types of ethephon on the market: aqueous solution and oil solution. No matter which one is used, it is necessary to check whether it is invalid before use. A small amount of TC can be poured on the concrete floor, and more foaming proves effective. If the liquid medicine produces precipitate, it can be heated and shaken with warm water at 70~80℃. After the precipitate dissolves, it will not affect the efficacy. 2. Medicinal properties. Ethephon is acidic and will decompose rapidly when it meets alkaline substances. Therefore, ethephon is strictly prohibited to mix with alkaline pesticides, nor can it be diluted with alkaline water such as pit water. Ethephon can release ethylene gas above pH 3.8. 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 parcel. Cotton fields with greediness, late maturity, strong late development and intercropping and summer sowing should be selected. It is not suitable for cotton fields with normal growth and development and premature senescence trend, otherwise it will cause premature wilt of cotton and lead to yield reduction. For improved seed breeding fields, generally do not use, otherwise it will lead to reduced germination rate of cotton seeds. 4. Time of application. Ethephon can only be decomposed and released ethylene in an environment above 20℃. Dry and high temperature weather is conducive to improving its efficacy. Therefore, it is generally mastered 20 days before frost, 80% cotton hanging bolls 40~45 days, daily maximum temperature above 20℃ spraying. If it rains within 12 hours after spraying, spray once more. The best spraying time in Huang-Huai-Hai cotton area is October 5. 5. Application concentration. Generally, cotton fields are sprayed with 100~150 grams of stock solution and about 60 kilograms of water to prepare 0.15%~0.25% of liquid medicine. For cotton fields that are seriously greedy or eager to vacate, the concentration can be increased, but generally does not exceed 0.3%. 6. Spraying method. For cotton fields with greediness and late-maturity or plucking cotton and wheat, spraying only once has too great influence on upper young bolls, so it can be sprayed twice. That is to say, the bolls in the middle and lower parts of cotton plants are sprayed in the middle and late September, and when the bolls in the lower parts are opened in the first ten days of October, the bolls at the top are sprayed again. Since ethephon is absorbed slowly, it should be sprayed on cotton bolls as much as possible. Attention should be paid to picking bolls before spraying, so as to avoid contamination and reduce cotton quality. Click for more cotton planting techniques Click for more conditioner application techniques Click for more pesticide application techniques