Because infrared is a kind of light that can emit a great deal of heat. Heat may discolor or kill plants, especially those plants haven't recently been watered. However too much infrared may actually damage plants. A short exposure to infrared increases the space between nodes. Increasing this light can affect the growth speed of plants' stems.
Under the irradiation of infrared, the ripening of fruits tends to be uniform. Infrared produces heat effect, which provides heat for the growth and development of crops.
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