The reason why purple eggplant is not well colored
The temperature is too low, especially in the latter half of the night, which causes the eggplant lycopene to be blocked and the eggplant is difficult to color. When the temperature of the solanaceous vegetables reaches 24 °C, the formation of lycopene is the best.
Insufficient illumination
Continued foggy weather, resulting in insufficient light. The eggplant is a hi-light crop. The light is not enough to grow the plant, the yield is reduced, the pigment is not easy to form, the color of the fruit is light and the color is easy to produce, especially the purple eggplant is not easy to color, which directly affects its commodity value. In addition, under low light conditions, if malnutrition is encountered again, the occurrence of poorly colored fruit will be aggravated. In the low light and rainy weather, the degree of poor fruit coloration is aggravated.
Excessive application of nitrogen fertilizer
Excessive use of nitrogen fertilizer, especially excessive nitrogen application in the late growth stage, will make the plant grow so long that the leaves squeeze each other and obscure, which affects the ripening of the fruit and leads to poor coloration. In the later stage, the amount of nitrogen fertilizer should be reduced as much as possible. If the plant grows badly, some foliar fertilizer can be sprayed to solve it. When the coloring is not good, the organic fertilizer can be applied in combination with potassium sulfate, which can significantly increase the fruit coloring index.
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