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First, master the nature of the drug
Compared with 2,4-D and 2,4-D, 2,4-D has a fast effect, and the effect of preserving flowers and fruits is good, but the concentration is difficult to master, and it is easy to produce deformed fruit; the anti-falling hormone is safer and less prone to deformed fruit. But the effect is slower.
Second, the application period should be accurate
It is best when the flower is yellow, not completely open, or the flower is flared. However, it is generally considered that it is effective from 3 days before flowering to 2 days after flowering. Premature application may cause burnt flowers, and it will not work until the flower is lantern-shaped. Usually, the flowers are better in the afternoon on a sunny day. In the morning, the concentration of the liquid is changed due to the condensation on the surface of the flower handle, which is prone to phytotoxicity.
Third, the concentration should be appropriate
The concentration of the anti-falling hormone is generally 20 ppm to 40 ppm, and the effect of the concentration is too low, and the effect is too high, and the deformed fruit and the hollow fruit are easily present. The concentration should also change with the change of the external temperature. Generally speaking, the concentration is low at high temperature and high at low temperature. It is best to carry out the flowering test before application: choose a few normal flowers. If the ovary of the flowering flower begins to expand in 4 to 5 days, it indicates that the concentration is appropriate, and this concentration can be used. Premature expansion indicates that the concentration is too large, and the expansion is too late to indicate that the concentration is too small.
Fourth, the method should be appropriate
Prevent spraying the liquid onto the young leaves or growing points, otherwise the leaves will become strips. In the event of phytotoxicity, the supply of fertilizer and water should be strengthened to reduce the phytotoxicity appropriately. To avoid repeating the scent, it is best to add a little pigment to the solution as a marker.
Tomato application of anti-fallin four attention
The problem of falling flowers and falling fruits of tomatoes can be solved by the method of spraying and sputum-proofing (tomato spirit). However, we must pay attention to the following four points in the application:
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