Many years of practice have shown that the correct use of ethephon ripening in late-maturing cotton fields is a good measure to facilitate production and increase production. Epoxy-fermented late-maturing cotton can be boiled for 7-10 days earlier, with an increase of 10%-20% before frost, an increase of 6.4%-10.2%, and an increase of 50-100 yuan per acre. And ripening cotton fields are also conducive to the sowing of crops such as wheat and the increase of yield. However, ethephon is a “double-edged sword”. If it is used improperly, it will not only increase production but also reduce production. Therefore, we must accurately grasp the use of ethephon technology to achieve scientific use, in order to achieve the desired results.

Selection of suitable cotton fields to be used to select the late glutinous green and late strong cotton fields, mainly interplanting cotton fields, summer sowing cotton, and strong hybrid spring cotton. If more than 80% of cotton bolls are in 40-45 days of cotton field, the effect of pesticide application will be particularly good. For normal and mature cotton fields, especially cotton fields with premature aging, ethephon can not be sprayed, otherwise it will cause premature decline of cotton plants, resulting in reduced yield. For cotton grown in fine varieties, ethephon cannot be sprayed. If spraying, the use value of seeds will be greatly reduced.

Appropriate time for proper application of pesticides

The effect of spraying ethephon is closely related to temperature. Ethylene must be decomposed and released at temperatures above 20°C. Therefore, after the cotton fields are sprayed, it is required that the maximum daily temperature can be 15 days or more at a temperature of 20° C. or higher in order to receive good results. According to this principle, the spraying time of northern China's cotton district is mainly based on the frost-reducing period, and it should be 20 days before the frost period. In general years and under normal circumstances, it is advisable to spray it around the beginning of October in North China.

Spraying method and dosage

In the early October application, 100% of 40% ethephon was used per acre, 50 kg of water was diluted and sprayed evenly; if it was applied at the end of October to early mid-year, 150 ml of medicine was needed per acre, and 60 kg of water was used. Dilute and spray evenly. The diluted drug solution is directed to the blue bell of the cotton plant that has been on the bell for more than 40 days, and is evenly sprayed from the top to the bottom so that each boll that needs ripening is stuck with the liquid medicine.

Ethephon sprayed with 2% superphosphate mixture

Late cotton spray 2% superphosphate dilution, promote premature, prevent premature aging, increase production, increase income, etc., generally can increase production by about 5%. Due to the fact that superphosphate is an acidic fertilizer and mixed with acidic ethephon, it will not only affect the efficacy of ethephon, but it can also play a synergistic role. It is worth promoting in accordance with local conditions. Method: First, 1 kilogram of high-quality superphosphate, use 50-60 kilograms of clear water to open, filter off the residue, then add the required ethephon per acre, and spray evenly after mixing.

Some Problems to Be Noted When Using Ethephon

First, ethephonic acid pesticides are susceptible to decomposition due to alkaline substances, so they must not be mixed with alkaline pesticides. The prepared ethephon diluent should not be stored, so it should be used with the preparation. Second, after spraying ethephon in the cotton field, if it rains within 6 hours, it needs to be sprayed again after the rain. Before the application of pesticides, the bolls of the boll opening should be harvested so as not to cause the quality of the batting caused by spraying to decline.

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