The use of ethephon (ecpa) to promote the differentiation of female flowers in greenhouse cucumber seedlings has become a mature technology applied in production practice. However, there are still many vegetable farmers who cannot accurately grasp the concentration of the drug, causing the concentration to be too high, causing the seedling growth to stagnate, the flower topping and the formation of a dead seedling, and the growth point is dry and dead in severe cases. Here, the remedies for the greenhouse cucumber damage by ethephon are introduced as follows:
1. After strengthening the management of phytotoxicity of fertilizer and water, according to the degree of phytotoxicity, increase the application of quick-acting nitrogen fertilizer and increase the number of irrigation to ensure sufficient supply of water and fertilizer.
2. The temperature suitable for improving the temperature of the cucumber in the greenhouse during the day is 25-28 °C and 13-15 °C during the night. After the damage, the shed temperature should be increased to 30 °C during the day to promote the growth of the seedlings; the original low temperature can be maintained at night to ensure the continued differentiation of the female flowers.
3, spray gibberellin cucumber four leaves one heart period with ethephon treatment, the concentration of more than 200ppm that occurs phytotoxicity, at this time can be sprayed with 20-50ppm gibberellin. The specific precautions are as follows: (1) The currently applied gibberellin is a crystal bagged product. It should be dissolved in alcohol or white wine and then prepared according to the concentration. (2) It should be sprayed early after the symptoms of phytotoxicity appear, otherwise the effect will be poor. (3) After one week of spraying for the first time, the second time of spraying, all of them can be restored to normal after about 15 days.
1. After strengthening the management of phytotoxicity of fertilizer and water, according to the degree of phytotoxicity, increase the application of quick-acting nitrogen fertilizer and increase the number of irrigation to ensure sufficient supply of water and fertilizer.
2. The temperature suitable for improving the temperature of the cucumber in the greenhouse during the day is 25-28 °C and 13-15 °C during the night. After the damage, the shed temperature should be increased to 30 °C during the day to promote the growth of the seedlings; the original low temperature can be maintained at night to ensure the continued differentiation of the female flowers.
3, spray gibberellin cucumber four leaves one heart period with ethephon treatment, the concentration of more than 200ppm that occurs phytotoxicity, at this time can be sprayed with 20-50ppm gibberellin. The specific precautions are as follows: (1) The currently applied gibberellin is a crystal bagged product. It should be dissolved in alcohol or white wine and then prepared according to the concentration. (2) It should be sprayed early after the symptoms of phytotoxicity appear, otherwise the effect will be poor. (3) After one week of spraying for the first time, the second time of spraying, all of them can be restored to normal after about 15 days.
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