How to prevent tomatoes from falling and falling

In the flowering stage of spring 茬 tomatoes, it is inevitable to encounter severe weather such as yin, rain, snow and fog. The temperature is low and the light is insufficient, which affects the normal pollination and fertilization. At present, auxin is used for prevention and control, and good results have been obtained. The types are 2.4-d, tomato spirit and high-yield agent No. 2.

2,4-d can stimulate plant growth at low concentrations, prevent falling flowers, and inhibit growth at high concentrations. It is characterized by quick fruit setting, high fruit setting rate, and promotion of early maturity. It can be harvested 4-6 days earlier. It can only be used for flowering or smearing flower handles. When the concentration is slightly larger, it is easy to produce a deformed fruit. The application concentration is 10-20 mg/kg, the low concentration is used when the temperature is high, the high concentration is used when the temperature is low, and the red food additive is added to mark, so as to avoid the deformed fruit caused by repeated sputum. It is advisable to use flowers that are open on the same day. It will reduce the treatment effect too early and too late, and small flower buds should not be treated. It is best to keep the flowers in the middle of the two heads according to the number of fruits left per ear, so as to ensure that the fruits are neat and consistent. Apply a small amount of 2,4-d solution to the separation layer of the flower handle with a brush to prevent dripping on the young leaves and growth points.

The tomato spirit can be used for flowering and painting, and it can also be sprayed directly, which is not easy to produce deformed fruit, and it is safe to apply. However, after the initial use, the fruit expanded slowly, and gradually accelerated after half a month.

The high-yield agent No. 2 combines the advantages of tomato spirit and 2,4-d, and the effect of preserving flowers and fruits is good, but the effect of applying flower handle is not good, and it needs spray. High Yield Agent 2 is used at a concentration of 20-30 mg/kg. The concentration of tomato spirit is 25-50 mg/kg, which is also adjusted according to temperature. When applying, strictly prepare according to the instructions. Pour the prepared solution into a small bowl, add red, dip the flower head with 3-4 flowers, gently shake the inflorescence, and let the excess solution flow into the bowl.

Apply high-yield agent No. 2 and tomato spirit. You can also use a small sprayer to align the flowering spikes. When spraying, use paper to cover the growth points and leaves, and spread the flowers with no drops. This method is convenient and easy to use, but the dosage is large.

In order to prevent tomato gray mold, 0.2% of Scopolamine or Nongling and Couine can be added when formulating hormones.

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