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Research on LED's Application in Plant Facility Cultivation
As of 2013, the area of facility horticulture in my country has developed rapidly, and the light environment control lighting technology for plant growth has attracted attention. Facility horticulture lighting technology is mainly used in two aspects: first, as supplementary lighting for plant photosynthesis when the amount of sunshine is small or short, and second, as inducing lighting for plant photoperiod and light morphology.
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, radish and lettuce, and improve morphological indicators; it can maximize the bioaccumulation of sugar beet and the most significant accumulation of betanin in the hair roots, which are produced in the hair roots. The highest sugar and starch accumulation.　Compared with metal halide lamps, the anatomical morphology of the stems and leaves of pepper and perilla plants grown under LEDs that match the wavelength has changed significantly, 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. LEDs are used as induced lighting for the photoperiod and light morphology of plants. LEDs of specific wavelengths can affect the flowering time, quality and duration of the flowering period of plants. LEDs of certain wavelengths can increase the number of flower buds and flowering of plants; LEDs of certain wavelengths can reduce the flower formation response, regulate the length of the stalk and the flowering period, which is conducive to the production and marketing of cut flowers. This shows that LED regulation can regulate the flowering and subsequent growth of plants.
3. Research on LED application in aerospace ecological life support system Straw hat with lamp beads
Establishing a Controlled Ecological Life Support System (CELSS) is the fundamental way to solve the problem of long-term manned space life support. The cultivation of higher plants is an important element of CELSS, and one of the keys is light.
Based on the special requirements of the space environment, the light source used in the cultivation of higher space plants must have high luminous efficiency, output light waves suitable for plant photosynthesis and light morphogenesis, small size, light weight, long life, high safety and reliability records and no environment Pollution and other characteristics. Compared with other light sources such as cool white fluorescent lamps, high-pressure sodium lamps and metal halide lamps, LEDs are more effective in converting light energy into photosynthetically effective radiation, and plants have a better light supplement effect; in addition, it has a long life, small size High power lamp beads 1W, light weight and Because of its solid-state characteristics, LEDs are highly valued in ground and space plant cultivation. Studies have shown that LED lighting systems can provide lighting with uniform spectral energy distribution, and the efficiency of converting electrical energy into light required by plants is more than 520 times that of metal halide lamps Light Emitting Diode Lamp beads.