The temperature is too low, especially in the second half of the night, which causes the eggplant lycopene conversion to be blocked and the eggplant is difficult to color. When the temperature of nightshade vegetables reaches 24℃, the formation effect of lycopene is the best.
Insufficient light
The continuous cloudy and foggy weather caused insufficient light. Eggplant is a light-loving crop. Insufficient light, weaker plant growth, reduced yield, poor pigment formation, lighter fruit color, and variegated color, especially purple eggplant is not easy to color, which directly affects its commercial value. In addition, under low light conditions, if you encounter malnutrition again, it will aggravate the occurrence of poor coloration. In low light and continuous rainy weather, the degree of poor coloration of the fruit worsens.
Too much nitrogen fertilizer
Excessive use of nitrogen fertilizer, especially in the later stage of growth, will cause plants to grow too much, so that the leaves will squeeze and shade each other and affect the ripening of the fruit, resulting in poor coloration. Try to reduce the amount of nitrogen fertilizer used in the later stage. If the plant is not growing well, spray some foliar fertilizer to solve it. When the coloring is not good, it can be used in combination with organic fertilizer and potassium sulfate, which can significantly increase the color index of the fruit.
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