The hottest thing to talk about is ultraviolet lig

2022-08-26
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Talk about ultraviolet light in plant lighting

with the concept of modern agriculture and new agriculture pouring in and the voice is rising, with the development of urbanization becoming more and more intense, the cultivated land area is becoming scarce, the environment is also becoming worse due to the long-term economic form, so the problem of food safety is also becoming increasingly prominent. As the "12th Five Year Plan (year)" for the development of agricultural science and technology points out that "it is a critical period for building a well-off society in an all-round way and a crucial stage for synchronously promoting agricultural modernization in the in-depth development of industrialization and urbanization. The task of ensuring national food security, increasing farmers' income and sustainable agricultural development is more arduous. We must accelerate the innovation of agricultural science and technology and enhance the supporting capacity of agricultural science and technology." The concept of plant factory also flourished in the new wind of policy and entered the stage of practical application

CSA research points out that China has made phased progress in surpassing the application of lighting technology in 2016. Shenzhou 11 manned spacecraft has carried out scientific experiments of planting lettuce in space, and led plant lighting has become a highlight of Shenzhou flying. In 2016, the market demand for semiconductor lighting applications can be described as sunrise in the East and rain in the West. Traditional alternative markets such as LED lighting are accelerating their penetration, and emerging market segments such as plant lighting have become market hotspots. At the same time, the "13th five year plan" for the semiconductor lighting industry will be released in early 2017, and the introduction of the plan will clarify the direction of the next development focus and development mode of the industry

the arrival of the national "13th five year plan" will further focus on seven key development areas, "LED energy-saving light source, three-dimensional soilless cultivation, light temperature coupling energy-saving environmental control, nutrient solution regulation, network-based intelligent management, artificial light plant factory, natural light plant factory integration demonstration", so as to alleviate the increasingly prominent food crisis, and then promote the research of various related disciplines. As the "LED energy-saving light source" in the seven key development fields, our technology can be used as a reference. UVLED plays an important role and has a broad prospect in the field of plant factories

the production efficiency of open field agriculture is directly related to the quality of light conditions, so the saturation acquisition of light must depend on the severity of weather influence. Similarly, the speed of plant growth is directly related to the influence of weather on light. The concept of plant factory has many advantages: high production efficiency, good controllability and broad application prospects. The artificial use of electric light sources in plant factories to extend and supplement the lack of sunlight for plants and provide the required light. Through the application of technical means and equipment such as soilless cultivation, special nutrient solution, ventilation, constant temperature and humidity, it is undoubtedly an efficient, harmless and high-tech agricultural model

the contribution of different spectra of sunlight to plant photosynthesis varies. Only the light in the range of 400-700nm is the effective radiation of plant light cooperation, and it reacts with the process of plant carbohydrate synthesis light. According to the distinction between visible light and invisible light, invisible light contains a wave band with a wavelength less than 380nm. This wave band is called "ultraviolet light" (UV for short), which can effectively radiate plants. UV and far-infrared light have a regulatory function on plant growth and development, and have important application value for agricultural production

the closed glass greenhouse or sunlight temperature of plant factory pan will also increase the room structure of new research and development fields such as formula and chemical process engineering, with sunlight as the main light source, so the indoor UV radiation distribution is closely related to the transmittance of glass, sunshade and greenhouse film materials. The above materials are affected by natural light absorption, filtration, shielding, aging and other factors, and the transmittance of ultraviolet (UV) to these covering materials is only 15.9-21.1%, It greatly reduces the utilization quality of sunlight and greatly reduces the amount of ultraviolet (UV) radiation. The UV radiation of plants in traditional agricultural factories is also caused by the UV radiation components contained in traditional fill light lamps and the extremely uneven light distribution, and in order to achieve the precise application of ultraviolet light (UV) to affect plant growth

at present, in traditional agricultural planting or artificial cultivation, fluorescent lamps, mercury lamps, high-pressure sodium lamps and other lamps are only combined with the red and blue light emitted by LED as the main spectrum, which obviously lacks the components of UV spectrum. Due to the lack of ultraviolet light in the facility, serious growth and quality problems of plants are caused. The technical demand for optimizing the composition of high-efficiency spectrum of fill light is very urgent. As a new application light source with energy-saving, controllable, adjustable and efficient, LED has made continuous breakthroughs in the core technology level and the application technology has been continuously extended. The utilization and regulation of ultraviolet light in plant factories is very important to ensure high quality and high yield. The application of artificially controlled ultraviolet (UV) light source to supplement UV radiation technology can reduce the growth of plants caused by chemical methods and improve plant quality, which is an important guarantee for the production of green organic food. However, so far, there is little research on the regulation mechanism of medium and long wave ultraviolet light on the nutritional quality of vegetables, especially antioxidants! Lack of technology and equipment for effective management of ultraviolet light

uv artificial light regulation has a good application value in achieving high quality and high yield in protected horticulture, but in the application, it should be used to select the type of crops, the application target, the application dose, and other replacement materials during irradiation, there are short circuiting machines to ensure the application safety. In the selection of crop types, vegetables, medicinal plants, flowers and fruit trees can be used. The main application goals are to control the overgrowth of plants and improve the quality of crops, such as increasing the content of antioxidants in vegetables, increasing the accumulation of secondary metabolites in medicinal crops, accelerating the synthesis and accumulation of chromogenic substances in flower leaves and petals, etc. In order to control the effect of ultraviolet light (UV), the amount of UV radiation must be well controlled, such as using short-term low-dose, intermittent repeated irradiation, pre harvest short-term irradiation and other methods to use the dose reasonably

therefore, the emergence of UVLED and its large-scale application to artificial lighting of various plants in the field of agricultural lighting, with its outstanding advantages of energy conservation and environmental protection, cold light source, long service life, small volume, pure light quality, high luminous efficiency, rich wavelength types, easy spectral energy recombination, convenient modulation and so on, will help the new round of plant factory mode to make more rational use of light sources and wavelength bands, To meet the different needs of different plants for light, and to achieve the purpose of increasing production, environmental protection and pollution-free

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