Introduction of LED plant growth lamp

Introduction of LED plant growth lamp

Principle:


Light environment is one of the important physical and environmental factors which are indispensable for plant growth and development. It is an important technology in the field of facility cultivation to control plant morphogenesis through light quality regulation.


Features:


The wavelength type is abundant and coincides with the spectral range of plant light synthesis and light morphogenesis; the width of the spectrum wave is half and narrow, and the pure monochromatic light and compound spectrum can be obtained according to the need. The light balance of the crop can be concentrated in a particular wavelength, and the flowering and seed setting of the crops can be adjusted and the plant height can be controlled. It can be used in multi-layer cultivation and three-dimensional combination system to achieve low heat load and miniaturization of production space.


Application of LED in plant cultivation


Light environment is one of the important physical and environmental factors which are indispensable for plant growth and development. It is an important technology in the field of facility cultivation to control plant morphogenesis through light quality regulation.


As the fourth generation of new lighting sources, LED has many characteristics different from other electric light sources (Table 1), which makes it the first choice for energy saving and environmental protection light sources. LED, used in the field of plant culture, also shows the following characteristics: rich wavelength type, coinciding with the spectral range of plant light synthesis and light morphogenesis; the width of the spectrum wave is half and narrow, and can be combined to obtain pure monochromatic light and compound spectrum according to the need. In order to regulate the flowering and seed setting of crops, and control plant height and plant nutrition, the system has little heating and small space, and can be used in multi-layer cultivation three-dimensional combination system, realizing low heat load and miniaturization of production space; in addition, its strong durability also reduces transportation cost. Because of these remarkable characteristics, LED is very suitable for plant cultivation in controlled environment, such as plant tissue culture, facility gardening and factory nursery and space ecological conservation system.


Study on the application of LED in plant cultivation


In recent ten years, the Protected Horticultural area in China has been developing rapidly. The lighting environment controlled by plants has attracted much attention. The facilities of horticultural lighting are mainly used in two aspects: 1. As supplementary lighting for plant photosynthesis when the amount of sunshine is less or the time of sunshine is short, and two, the induced illumination of the plant photoperiod and the form of light.


1, LED as a supplementary lighting for plant photosynthesis, the traditional artificial light source produces too much heat, such as LED supplemental lighting and hydroponic system, the air can be recycled, excessive heat and moisture can be removed, and the energy can be efficiently converted into effective photosynthesis, and eventually converted into plant material. The results showed that the growth rate and photosynthetic rate of lettuce increased by more than 20% by LED illumination. It is feasible to use LED in a plant factory.


It was found that compared with the fluorescent lamp, the LED light source with the mixed wavelength could significantly promote the growth and development of spinach, radish and lettuce, and improve the morphological index. The accumulation of beet biomass was the largest, the accumulation of Mao Genzhong beet content was the most significant, and the highest sugar and starch accumulation in Mao Genzhong.


Compared with the metal halide lamp, the growth of pepper and perilla plants under the wavelength of LED showed significant changes in the anatomical morphology of the stems and leaves, and the photosynthetic rate of the plant increased with the increase of light density. Compound wavelengths of LED can increase stomatal number in two plants of marigold and Salvia.


2. LED is the induced illumination of plant photoperiod and photoperiod.


LED at specific wavelengths can affect flowering time, quality and duration of flowering. Some wavelengths of LED can increase the number of flower buds and the number of flowering plants; some wavelengths of LED can reduce flower formation, regulate the length and flowering period of the pedicels, and are beneficial to the production and listing of cut flowers. It can be seen that LED regulation can regulate flowering and subsequent growth of plants.


Study on the application of 3 and LED to the space ecological protection system


The establishment of Controlled Ecological Life Support System (CELSS) is the fundamental way to solve the problem of long-term manned spaceflight life support. The cultivation of higher plants is an important component of CELSS, which is one of the key lights.


Based on the special requirements of the space environment, the light source used in the space higher plant cultivation must have high luminous efficiency and the output light wave is suitable for plant photosynthesis and morphogenesis, small volume, light weight, long life, high safety reliability record and no environmental pollution. Compared with other light sources such as cold white fluorescent lamp, high pressure sodium lamp and metal halogen lamp, LED can effectively convert light energy into photosynthetic effective radiation. In addition, it has the characteristics of long life, small volume, light weight and solid state. Therefore, it has been paid much attention in the plant culture of ground and space in recent years. Research shows that the LED lighting system can provide uniform illumination for spectral energy distribution, and its power conversion to plant light is 520 times higher than that of metal halide lamps.


Give an example:


Using chrysanthemum as the test material, 120 stems of strong chrysanthemum were selected and divided into 2 groups, 60 in each group. Cutting the segment of the leaf with a length of about 12cm and cutting the base into wedge-shaped surface and treating the base with 10PPM naphthalene acid for 12 hours, and then quickly propagating in the natural light intelligent bed and the red light bed with the plant growth lamp, to observe and record the growth of the stem segments. Chlorophyll content was measured by extraction. On the 3612nd day of culture, the leaves of 0.2g were cut evenly and the 1:1 was separated by ethanol.