Recently, many vegetable growers have raised concerns about the poor coloration of their tomatoes, which has significantly impacted the quality and market value of the produce. As the greenhouse tomato crops are entering their peak yield period, the issue of unattractive coloring has become a major concern. To address this, the author reached out to Mr. Liu Mingjie, a senior expert from the Vegetable Association of Shouguang City, Shandong Province, who provided detailed insights into the causes and solutions for poorly colored tomatoes. Firstly, the color of tomatoes is largely determined by their genetic makeup. Some varieties, like the 189 variety, are known for their deep red color. However, if the variety itself is not ideal, it may struggle to develop proper pigmentation regardless of external conditions. Light is another crucial factor in tomato coloring. If the plants are too densely planted, they may shade each other, leading to insufficient light exposure on the fruits. This can result in pale or uneven coloring. In winter, the light transmission of the greenhouse film also plays a significant role. To improve light penetration, growers can choose high-quality films or regularly clean the existing ones to maintain optimal light levels. Fertilization practices also contribute to the problem. At this time of year, when temperature, moisture, and light are generally favorable, poor coloring often points to an imbalance in nutrients. Soil pH testing is recommended—when the pH exceeds 6.5, especially above 7, the soil may lack essential micronutrients. Growers can apply borax (2–3 kg per acre), zinc sulfate (5–6 kg), ferrous sulfate (6–7 kg), manganese sulfate (5–6 kg), and magnesium sulfate (10 kg) once a year. Alternatively, foliar sprays containing these elements can be used. A typical mix involves dissolving 25–35 grams of trace fertilizer in 15 liters of water and spraying every 5–7 days. For borax or boric acid, the concentration should be between 3,000 and 6,000 times diluted. It’s best to spray during sunny evenings, focusing on the underside of the leaves and keeping them moist for better absorption. Adding insecticides or fungicides can also help manage pests and diseases simultaneously. Finally, temperature plays a key role in lycopene development. While lycopene production increases when temperatures reach 24°C, excessively high temperatures can reduce the plant's photosynthetic efficiency, thereby affecting lycopene accumulation. Maintaining a consistent temperature around 24°C in the greenhouse is ideal for achieving good coloration in tomatoes. In summary, ensuring well-colored tomatoes requires attention to variety selection, adequate light exposure, balanced fertilization, and proper temperature management. By addressing these factors, growers can significantly improve the appearance and marketability of their tomato crops. API (Active Pharmaceutical Ingredients)
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The current tomato is not colored