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Ethephon ripening tobacco leaves can be treated with stems and leaves or post-harvest tobacco sheets in the late growth stage.
Stem and leaf treatment Generally, the whole plant is sprayed. Early and middle smoke, spray the ethephon solution with a concentration of 500-700 mg/kg in the summer sunny days (62.5-87.5 ml of 40% ethephon per acre, 50-100 kg of water), after 3 to 4 days, the tobacco plants Approximately 24 leaves (2 pieces each) can turn from green to yellow, just like natural maturity. For late smoke, the concentration should be increased to 1000-2000 mg/kg, and the light green leaves turn yellow after 5-6 days. You can also prepare a 15% ethephon solution, apply it around the stem of the leaf base, or peel the stem skin longitudinally about 1.5 cm wide and 4 cm long, then apply the ethephon solution for 3 to 5 days. The tobacco leaves above the part can fade and promote yellowing. Ethephon has a duration of efficacy of 8 to 12 days on tobacco, and can also be used twice for the lower and upper leaves during the tobacco growing season.
Post-harvest treatment The freshly harvested tobacco leaves are impregnated with a 500-1000 mg/kg ethephon solution and then baked, and the flue-cured tobacco is yellow in color. In the baking process of the tobacco leaves, a container containing an ethephon solution having a concentration of 450-700 mg/kg is placed in the baking room to allow the self-release of ethylene gas, which can promote the yellowing of the tobacco leaves and increase the level of the tobacco leaves.
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