Watermelon grows vigorously and has high water content. It is sensitive to many chemical agents. Once the application concentration is too large or the drug is improperly selected, it is easy to cause phytotoxicity. The remedy after the occurrence of phytotoxicity in watermelon is:
1. Rinse with water. Most chemical agents are not resistant to water scouring. If the concentration of the drug is too large, the spray may be filled with clean water and sprayed repeatedly on the stems and leaves to wash away the residues remaining on the surface of the plant to reduce the phytotoxicity. The air pressure of the sprayer should be sufficient, and the amount of water sprayed should be large.
2. Attack with poison. Potassium permanganate is a strong oxidant that oxidizes and decomposes a variety of chemicals. According to the experiment, when the watermelon is phytotoxic or the drug is found to be improper, immediately spraying 5000-7000 times of potassium permanganate can alleviate the phytotoxicity.
3. Suspend medication. Minimize the use of chemical pesticides before the phytotoxicity has been completely removed, especially to stop using similar pesticides, so as not to aggravate the phytotoxicity.
4. Strengthen management. After the phytotoxicity of watermelon, combined with watering to properly supplement some quick-acting fertilizers, and timely cultivating loose soil, can promote the plant to resume normal growth and development as soon as possible. In addition, it can also be combined with root fertilization and watering, and the foliage is sprayed with phosphorus and potassium fertilizer to improve the nutritional status of the plant and enhance the root absorption capacity. The method is as follows: 1 kg of high-quality superphosphate, 40-50 kg of water, soak for one night, take the supernatant to spray the watermelon stems and leaves, or spray 50 kg per mu with 0.2%-0.3% potassium dihydrogen phosphate solution.
1. Rinse with water. Most chemical agents are not resistant to water scouring. If the concentration of the drug is too large, the spray may be filled with clean water and sprayed repeatedly on the stems and leaves to wash away the residues remaining on the surface of the plant to reduce the phytotoxicity. The air pressure of the sprayer should be sufficient, and the amount of water sprayed should be large.
2. Attack with poison. Potassium permanganate is a strong oxidant that oxidizes and decomposes a variety of chemicals. According to the experiment, when the watermelon is phytotoxic or the drug is found to be improper, immediately spraying 5000-7000 times of potassium permanganate can alleviate the phytotoxicity.
3. Suspend medication. Minimize the use of chemical pesticides before the phytotoxicity has been completely removed, especially to stop using similar pesticides, so as not to aggravate the phytotoxicity.
4. Strengthen management. After the phytotoxicity of watermelon, combined with watering to properly supplement some quick-acting fertilizers, and timely cultivating loose soil, can promote the plant to resume normal growth and development as soon as possible. In addition, it can also be combined with root fertilization and watering, and the foliage is sprayed with phosphorus and potassium fertilizer to improve the nutritional status of the plant and enhance the root absorption capacity. The method is as follows: 1 kg of high-quality superphosphate, 40-50 kg of water, soak for one night, take the supernatant to spray the watermelon stems and leaves, or spray 50 kg per mu with 0.2%-0.3% potassium dihydrogen phosphate solution.
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