Ethephon ripening ethephon is commonly known as ripening agent. After being absorbed by cotton plants, it releases ethylene, which increases the ethylene content in the boll, enhances the activity of peroxidase, and destroys the synthesis of auxin. The photosynthetic product is shipped out in a short period of time, which causes the cotton boll to mature. The correct use of ethephon should master the following points: First, the spraying time, the normal year is generally at the end of September and the beginning of October; the second is the highest temperature on the day of spraying is above 20 °C, preferably for several days, the temperature is above 20 °C; The third is that 80% of the cotton bolls on the cotton plant should be more than 40 days; the fourth is to master the dosage, use 40% ethephon 100-200 ml per mu to 40-50 kg of water, and spray evenly. Note that ethephon cannot be applied to seed cotton fields.
The effect of no trace of ripening and gram-free ripening has the following characteristics: rapid defoliation, high defoliation rate; concentrated vomiting, high flowering rate before frost. The correct use of gram without trace, one must master the ripening period, generally in late September and early October, the cotton boll period is applied over 45 days; the second is to choose the appropriate dose, 50 grams per gram is not suitable; Pay close attention to the weather conditions. Spraying the gram is not re-sprayed within 1 day after spraying. After 7-10 days after application, if there is continuous rainy weather, the medicine should be postponed to prevent the quality of cotton from falling. Spray pesticide evenly, and the amount of water per mu is 40-50 kg.
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