In plant factories, plants are flourishing: their chlorophyll is busy with photosynthesis, carotenoids are assisted by it, and photosensin is trying to straighten the hypocotyl "hook" and regulate the growth of stems and leaves... these pigments in plants It plays a vital role in the growth and development process.
It is understood that different plant species contain different pigments, and different pigment molecules absorb different wavelengths. For example, chlorophyll is mainly affected by red light and blue-violet light, and cryptochromes and photochromes are mainly affected by blue light. This property of pigment molecules requires companies to be more targeted in the spectral ratio, and to develop a corresponding light formula according to the type of plant and growth needs.
Different plant species have different spectral requirements
Plant pigments have different wavelength requirements for light, and a single spectral control obviously cannot fully meet the growth needs of various plants. However, due to factors such as time and resources, it is impossible to match the perfect spectrum for various plants one by one. Fortunately, the ratio of the spectra is regular.
Zhu Ming, Marketing Director of Luminus China, believes that for different stages of plant growth, there are some basic spectral ratios that can meet the growth needs of different plant species, such as plant growth and flowering, usually 1:3. : 1 or 1:4:1 (450 nm: 660 nm: 730 nm) light formulation. For green leafy vegetables (such as lettuce), a simple 450nm: 660nm combination (1:4 or more) is sufficient. For flowering plants grown around the world, he believes that white light can also be added to the light distribution.
“The requirements are very high. For precise optimization, it is usually possible to use intelligent plant lamps with adjustable spectrum or to accurately match the spectrum of the light source.†Luo Tie, research and development engineer of Yimeixinguang (Beijing) Technology Co., Ltd. supplement.
In recent years, the discussion of plant lighting has remained hot, and a large number of enterprises have poured in, and various plant growth lights have emerged one after another. China's LED plant lighting technology started late, the core technology is not enough, the photobiology law and LED light source device and lighting intelligent control system industrialization have many obstacles, and the high-precision spectral matching method needs further research and promotion.
"The lighting conditions that have a greater impact on plant growth include spectral matching, as well as light intensity and illumination time, and need to be considered comprehensively," Luo said. It is true that plant growth elements are indispensable in addition to light, temperature, water, and air, but the resolution of light elements is undoubtedly the most important.
Different parts of the plant have different spectral requirements
Hongqiang Zhihui senior engineer Zhang Qiang believes that in the spectral ratio, in addition to paying attention to the distinction of plant species, it should also consider the light requirements of different parts of the plant, such as roots, stems, leaves and other parts.
The lack of blue light during plant growth is not conducive to the development of the roots. If people need leafy plants, the lack of blue light will lead to root dysplasia, but the leaves will still grow under the action of light, but this plant will appear as "malnutrition"; if it is needed, the roots and plants The lack of blue light in the spectral ratio is fatal.
In addition, in the selection of the spectrum of the red segment, the rhizome plants should be more supplemented with red light and appropriately supplemented with infrared light. If the infrared light is excessively irradiated, the roots of the plant will grow thinner.
LED package is small in size and has many wavelengths. It can be used in plant lighting applications. It can be designed into various styles according to different plant types, purposes and needs. It can meet different planting techniques and is easy to adjust in addition to spectral ratio. Through the number of LEDs or electronically controlled design, the light intensity and total amount of light can also be precisely controlled. Coupled with high luminous efficiency (power saving) and long operating life, these are lacking in traditional lamps.
Nowadays, more and more different kinds of plants have been moved into plant factories. In addition to vegetables, fruits, flowers and so on, there are various kinds of medicines. The increase in plant species poses greater challenges for the company's spectral matching work, while at the same time bringing good opportunities for the advancement of spectral matching research. Mastering the core technology and matching the spectrum that meets the growth of different plants is the magic weapon for enterprises to win in the battle of plant lighting.
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