Tomato green fruit is a common issue that can be caused by various factors, with the main one being an imbalance in fertilizer application. Specifically, low nitrogen levels combined with high potassium or excessive use of nitrogen fertilizer can lead to this problem. Once the tomato plant enters its peak fruiting stage, adverse weather conditions such as low temperatures and weak light, along with improper fertilization practices like uneven nitrogen distribution, can further contribute to the development of green fruit.
To prevent tomato green fruit, several effective measures can be implemented. First, it's essential to add organic fertilizer and apply a balanced fertilization strategy. Avoid using ammonium-based fertilizers and instead focus on adjusting the ratio of nitrogen, phosphorus, and potassium in the soil to improve potassium uptake by the plants. This is considered one of the most critical steps in preventing green fruit.
Additionally, extending the time of sunlight exposure for the plants can help. When the fruit begins to change color, remove the lower and nearby leaves around the affected area to increase light penetration and reduce the chances of green fruit formation.
Strengthening the root system and overall plant health is also important. Applying foliar fertilizers rich in essential micronutrients such as boron, calcium, magnesium, iron, and zinc—especially those containing amino acids—can promote healthier foliage, enhance photosynthesis, and improve the absorption of key nutrients. This helps reduce issues like green skin and cracked fruits.
Controlling temperature is another crucial factor. During the day, keep the temperature between 25°C and 30°C, and at night, maintain it between 14°C and 16°C. The daily temperature difference should not exceed 15°C to avoid stress on the plant.
Balancing the number of fruits set on the plant is also important. Overloading the plant with too many fruits or having too few can both negatively affect fruit quality and color development.
When using flowering hormones, ensure their concentration is not too high. After the anther opens, provide proper fertilization to support healthy fruit development.
In greenhouses where green peel has already occurred, applying high-potassium foliar sprays and chitin solutions can help alleviate symptoms and improve fruit quality.
By implementing these strategies, growers can significantly reduce the occurrence of green fruit and improve the overall yield and quality of their tomato crops.
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