In the past ten years, the area of facility horticulture in China has developed rapidly, and the light environment control lighting technology for plant growth has attracted attention. The lighting technology of facility horticulture is mainly used in two aspects:
1. As supplementary lighting for plant photosynthesis when the amount of sunshine is low or the sunshine time is short;
2. As the induced lighting for the photoperiod and light morphology of plants.
1. Research on LED as supplementary lighting for plant photosynthesis. Traditional artificial light sources generate too much heat. If LED supplementary lighting and hydroponic systems are used, air can be recycled, excess heat and water can be removed, and electricity can be removed. Efficiently transform into effective photosynthetic radiation, and finally into plant matter. Studies have shown that the use of LED lighting can increase the growth rate and photosynthesis rate of lettuce by more than 20%, and it is feasible to use LEDs in plant factories.
Studies have found that, compared with fluorescent lamps, mixed-wavelength LED light sources can significantly promote the growth and development of spinach, radishes and lettuce, and improve morphological indicators; it can maximize the bioaccumulation of sugar beet, and the most significant accumulation of betanin in hair roots, and is produced in hair roots The highest sugar and starch accumulation.
Compared with the metal halide lamp, the pepper and perilla plants grown under the wavelength LED have significant changes in the anatomical morphology of their stems and leaves, and as the optical density increases, the photosynthetic rate of the plants increases. LEDs with multiple wavelengths can increase the number of stomata in marigold and sage plants.
2. LED as the induced lighting for plant photoperiod and light morphology
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