Recently, many cherry tomato growers have reported an issue with poor fruit coloration, which significantly affects their marketability and pricing. The author investigated the problem and identified several contributing factors, including high temperatures, intense sunlight, excessive nitrogen fertilizer use, and insufficient potassium application.
One major cause is the high temperature inside the greenhouses. The process of color development in cherry tomatoes involves the breakdown of chlorophyll and the synthesis of lycopene and carotenoids. However, when the temperature exceeds 30°C, this process is disrupted. In some cases, due to overcast weather followed by clear days, farmers removed shade nets, causing the internal temperature to rise above 40°C for extended periods. This extreme heat leads to poor coloration. To address this, the author recommends re-covering the shade nets to maintain a more suitable growing environment for the tomatoes.
Another factor is strong sunlight exposure. Observations show that fruits covered by leaves or shaded areas tend to develop better color, while those directly exposed to full sun often remain pale or yellow. This suggests that excessive light can inhibit lycopene formation, leading to poor coloration. To mitigate this, farmers should use shade nets on sunny days, improve ventilation, and avoid over-pruning leaves, as they naturally protect the fruits from too much direct sunlight.
A third issue is the imbalance in fertilizer use. Many farmers apply too much nitrogen, especially during hot periods, while neglecting potassium. Excess nitrogen can lead to a "green shoulder" effect, where the top of the fruit remains uncolored, while a lack of potassium results in yellow or greenish shoulders. To correct this, the author advises reducing nitrogen input and increasing potassium fertilizer during the fruit development stage. This balanced approach helps ensure better coloration and overall fruit quality.
In conclusion, addressing these factors—temperature control, light management, and proper fertilization—can significantly improve the color and market value of cherry tomatoes. Farmers are encouraged to monitor environmental conditions closely and adjust their practices accordingly for optimal results.
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