At this stage, light, temperature, and moisture levels are all ideal for tomato growth. However, poor fruit coloration often stems from an imbalance in fertilization. To address this, it's important to check the soil's pH using pH test paper. If the pH is above 6.5, especially if it exceeds 7, the soil is likely deficient in essential micronutrients.
To correct this, you can apply the following per acre: 1–1.5 kg of borax, 2.5–3 kg of zinc sulfate, 3–3.5 kg of ferrous sulfate, 2.5–3 kg of manganese sulfate, and 5 kg of magnesium sulfate. This treatment should be applied only once a year. In addition to soil application, foliar sprays containing micronutrients like boron, zinc, iron, manganese, and magnesium can be highly effective.
For foliar feeding, mix 25–35 grams of micronutrient fertilizer with 15 liters of water and spray every 5–7 days. If applying borax or boric acid separately, the dilution ratio should be between 3000–6000 times. It’s best to spray in the late afternoon on a sunny day, focusing on the underside of the leaves to maximize absorption. Keep the leaves moist for as long as possible to enhance nutrient uptake.
If needed, you can also mix in insecticides or fungicides to control pests and diseases simultaneously. This integrated approach not only improves fruit color but also promotes overall plant health and productivity. Always follow safety guidelines when handling fertilizers and pesticides, and consider consulting an agricultural expert for tailored recommendations based on your specific conditions.
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