At this stage, light, temperature, and moisture are all in suitable conditions. The poor coloring of tomatoes has a great relationship with fertilization imbalance. You can use pH test paper to measure the pH of the soil, when the pH is greater than 6.5, especially when it is greater than 7, the soil will inevitably lack trace elements. Can be applied with water per acre borax 2 ~ 3 kg, zinc sulfate 5 ~ 6, ferrous sulfate 6 ~ 7 kg, manganese sulfate 5 ~ 6 kg, magnesium sulfate 10 kg (according to this method per year can only be applied once) . Foliar can also be sprayed with trace elements containing elements such as boron, zinc, iron, manganese, magnesium, etc. Usually 25 to 35 grams of micro-fertilizer is weighed 15 kilograms every 5 to 7 days (if it is sprayed separately with borax or Boric acid, the concentration should be controlled at 3000 to 6000 times liquid). It is best to spray on a sunny evening, focus on spraying the back of the tomato leaves, keep the leaves moist as much as possible, extend the absorption time of the leaves, and when necessary, mix insecticidal fungicides to prevent and treat various pests and diseases at the same time.
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