In order to prevent the tomato from falling and falling, the more fruit hormones used in production are 2,4-D and anti-fallin. Farmers should pay special attention to the following points during their use:
Use concentration
The concentration of 2,4-D is generally 10ppm-20ppm, the concentration of the use of the anti-fallin is generally 20ppm-40ppm, the lower limit of the concentration is taken at high temperature, and the upper limit of the concentration is taken at low temperature. Before use, the flowering test should be carried out first, and several normal flowers should be smashed first. If the ovary begins to expand after 4-5 days, it indicates that the concentration is suitable; if the ovary begins to expand within 3 days, the concentration is too high; There is no swelling in the ovary, indicating that the concentration is too low.
2. Use time
It is best when the flower is seen when the flower top is yellow and not completely open or the flower is scalloped. It is easy to cause burnt flowers too early, and it will not work until the flowers are lanterns too late. In the sunny afternoon, the flowers are better. In the morning, the scent of the flowers will change due to the condensation on the surface of the plants, causing phytotoxicity.
3. Treatment site
Lightly apply the prepared solution to the flower stalk or peduncle with a brush, or soak the whole inflorescence in the solution. Do not sprinkle the solution on the young leaves or growth points of the plant during the treatment, otherwise the leaves will become strips. Fern leaves, slow growth, especially 2,4-D, the most susceptible to phytotoxicity.
4. Fertilizer supply
The use of hormonal flowers can prevent falling flowers and promote fruit hypertrophy, but there is no fertilizer effect. Therefore, after using hormones, it is necessary to scientifically and reasonably topdress and strengthen management. In addition, after the first ear fruit is used with the fruit hormone, the other ear fruits should be used. Otherwise, the fruit below absorbs a lot of nutrients, and the above-mentioned ear does not receive the necessary nutrients, and the phenomenon of falling flowers and falling fruits will occur.
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