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The temperature requirements of chillies lie somewhere between those of yarrow and eggplant. The optimum temperature for germination is 23-30℃, and below 15℃, seeds can not germinate. Pepper seedlings require high temperature, low temperature, slow growth. In the early stage of flowering and fruiting, the optimum daytime temperature was 20-25℃, and the night temperature was 15-20℃. In the fruiting stage, the soil temperature was too high, especially the strong light directly on the ground, which was unfavorable to the root growth, and easy to cause toxin disease and sunburn disease.