In agricultural production, preventing flowers and fruits from falling is an important task. The use of plant growth regulators not only saves labor and time, but also has a significant effect in preserving flowers and fruits. Today, the editor will give you a detailed introduction A commonly used method of using flower-preserving and fruit-preserving agents is for your reference.
1. Introduction to anti-falling agent
Sodium p-chlorophenoxyacetate: referred to as PCPA or 4-CPA. Other names: p-chlorophenoxyacetic acid, anti-falling agent, tomato spirit, harvest spirit, fruit setting spirit, growth promoting spirit, etc. It is a plant growth regulator widely used in the production process of fruit trees and vegetables. Its main function is to improve the fruit setting rate of crops. , promote the growth and development of young fruits.
2. Mechanism of action
Sodium p-chlorophenoxyacetate is a phenoxy plant growth regulator with auxin activity. It belongs to the auxin class, which can promote growth, prevent the formation of abscission layer, and promote fruit setting. Prevent tomatoes and other solanaceous vegetables from falling flowers and fruits, inhibit rooting of beans, promote fruit development, form seedless fruits, mature earlier, increase yield, improve quality, etc. It is safer than 2,4-D when applied and is less likely to cause phytotoxicity.
3. Applicable crops
Mainly used for eggplant, pepper, tomato, cucumber, watermelon and other fruit and vegetable crops.
IV. Preparation method
Commercially available anti-falling agents are generally 98% pure anti-falling agents. When using 1 gram of anti-falling agents, you must first use alcohol or high concentration Dissolve the soju and add water to dilute it to the desired concentration.
5. How to use
1. Eggplant: On the day when the eggplant blooms, use a mixed solution of 25-30 mg/L anti-falling hormone + 0.1% potassium dihydrogen phosphate. Flower stem or spray flower, 2 times in a row, 1 week apart each time. This can achieve the purpose of preventing flowers from falling.
2. Tomato: When 2-3 flowers bloom in the flower spike, spray the flower spike with a mixed solution of 25-30 mg/L anti-falling agent + 0.1% potassium dihydrogen phosphate. If When the number of flowers on the flower spike increases, you can re-spray the flowers that bloom later. Different plants and different flower spikes in the same field can be sprayed once every 3-5 days, depending on how wet the flowers are. This can prevent flowers from falling and promote fruit enlargement.
3. Chili peppers: Use a mixed solution of 25-30 mg/L anti-falling hormone + 0.1% potassium dihydrogen phosphate to dot the flowers once, which can achieve the purpose of preserving flowers and fruits and promote the growth of pepper fruits. grow.
4. Watermelon: On the day of flowering, use a mixed solution of 20 mg/L anti-falling hormone + 0.1% potassium dihydrogen phosphate to spot the flower stalks. It can prevent watermelon fruit drop.
5. Cucumber: On the day the young melons bloom, or 1-2 days after flowering, spray the young melons with anti-falling agent at a concentration of 100-200 mg/L to prevent the melons from decomposing and promote fruit growth. .
6. Green beans: When the second flower spike begins to bloom, spray the flowers with 2-5 mg/kg of anti-falling agent every 3-5 days, which can significantly improve the quality and yield. Pay attention to the entire flowering period. Spraying must be done before and after to continue to produce pods. Stopping it midway will affect the yield.
7. Pea: During the flowering period, spray the flowers with 2-3 mg/L anti-falling agent once every 4-5 days to increase the yield.
8. Chinese cabbage: 10-15 days before harvesting, spray 25-35 mg/L anti-falling solution in the afternoon on a sunny day. This can effectively prevent Chinese cabbage from falling off during storage and ensure freshness. effect.
VI. Precautions
1. When using, you can only spray flowers, not stems and leaves.
2. The spraying time should be in the morning or evening on a sunny day. Spraying at high temperatures, under the scorching sun or on rainy days is likely to cause phytotoxicity.