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1. Choosing the right variety The use of ethephon to ripen cotton is mainly used for the varieties of high yield and autumn peach.
2, master the time of medication to make ethephon better play the role of ripening, medication time is the most critical. Premature use of drugs, due to high temperature, short ring time of cotton bolls, cotton leaves premature aging and fall off, cotton bolls dry, resulting in reduced production; low temperature after medication, ethephon can not play the ripening effect, can not achieve the desired effect . The optimal spraying time depends on the development of the boll and the local temperature changes. Generally, it is sprayed about 20 days before the local frosting period, that is, from late September to late October, that is, most of the cotton bolls are mature (the cotton boll is about 45 days). Pay close attention to the weather changes before spraying, and keep it after spraying. The maximum daily temperature is above 20 degrees Celsius for 3 consecutive days.
3, the dosage of the agent should be appropriate to spray the whole field cotton plant with 40% ethephon 100-150 g/50-60 kg per acre in the appropriate spraying time, focusing on the green bell.
4, with the delimbing measures while spraying ethephon, should the upper newborn cotton shoots (including growing buds and tender bell less than 35 days) fully removed, in order to reduce cotton nutrient consumption, improve ventilation through the field light conditions, so that concentrated nutrient mature bolls earlier, early boll opening. Author Ma Shuping
Precautions for cotton with ethephon
Ethephon, also known as a test spirit, is a plant growth regulator, because its main role is ripening, it is also known as ripening agent. In the late stage of growth of cotton, cotton boll can typically 6-10 days earlier boll opening, before frost picker increased 20-30%, and can improve the gloss and cotton fiber quality. However, because a considerable number of farmers do not understand its use of technology, spraying too early or too late, not only does not play a ripening role, but has an impact on the normal floc and yield of cotton. So how to properly use ethephon to ripen cotton? Generally pay attention to the following 4 points.
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