Purple eggplant grows white eggplant
First, the temperature of the greenhouse is too low The temperature is too low, especially if the temperature is too low in the latter part of the night, which leads to the impediment of the transformation of the lycopene in the eggplant and the difficulty of coloring the eggplant. Solanaceous vegetables had the best lycopene formation at 24°C. Therefore, to adjust the temperature in good time, the results during the day temperature control at 25 °C -30 °C, night temperature with 16 °C -20 °C is appropriate.
Second, the lack of light continued to fog the weather, resulting in inadequate lighting in the shed. The eggplant is a hi-light crop, the lack of light grows weakly, the yield decreases, the pigment is not easy to form, the color of the fruit becomes light and the variegated colors are easily produced, especially the purple eggplant is not easy to be colored, which directly affects the commodity value.
3. Excessive use of nitrogenous fertilizers Nitrogen fertilizers are used excessively, especially if too much nitrogen fertilizer is applied during the late growth period. This will make the plants grow serious enough that the blades will squeeze and obscure each other, affecting the ripening of the fruit and causing poor coloration. In the later period, the use of nitrogen fertilizer should be minimized. If the plants are not growing well, some foliar fertilizers can be sprayed to solve the problem. When the coloring is not good, organic fertilizer can be used in combination with potassium sulfate, which can significantly improve the fruit coloring index.
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