The application of LED in agricultural lighting is still in the initial stage, but countries that are optimistic about its application prospects are planning one after another. In terms of patents, according to the Chinese academy of agricultural sciences facility agricultural research center, there are nearly 100 patents available in the field of LED agricultural lighting at home and abroad, among which South Korea and China have the largest number of applications, followed by Japan and the United States. In general, the current innovation in LED agriculture is mainly in application innovation and technology integration, and the application direction is concentrated in plant growth lamp, livestock and poultry farm light, fish lure lamp, selective pest trap lamp and so on.
The status quo
Over the years, scholars at home and abroad have made unremitting explorations on the application of LED light source in the field of plant lighting, and made important progress. Firstly, the effects of red and blue light sources and their combination on plant growth and development were studied, which fully proved the feasibility of planting plants with red and blue light sources [9 ~ 13]. Tanaka et al. used LED for plant cultivation, and the results showed that when the duty cycle reached 25% ~ 50%, plant growth could be accelerated. Compound light quality is more suitable for plant growth than single light quality and can cultivate plants normally. In China, some researches and reports have been made on the application effect of LED in seedling cultivation, vegetable cultivation and greenhouse light supplement, and the energy saving effect is remarkable. So far, LED has been successfully used in plant cultivation, and has made important progress in the fields of plant lighting, tissue culture, plant factories and aerospace.
Artificial lighting is one of the important means to control the environment of livestock and poultry breeding. The artificial light source used in the field of breeding is difficult to regulate the light quality according to the physiological needs of livestock and poultry, which restricts the improvement of livestock and poultry production efficiency. Through appropriate LED light regulation, the researchers significantly promoted the growth of livestock and poultry, and improved their immunity, enhancing the production potential of livestock and poultry breeding. It shows that the application of LED in facility breeding industry is feasible and has a good application prospect. Andrew sobel research such as the red, white, respectively in continuous illumination (23 l: 1 d) and intermittent illumination (1 l: 3 d) under the effect on the performance of AA broiler chickens commodity production, the results show that the intermittent illumination can raise feed remuneration ratewas, red can improve ratewas feed remuneration, can enhance the growth speed of broiler chickens, again in the red light and intermittent illumination, under the joint action of highest ratewas feed reward, weight is bigger, the best economic benefits.
The study of biological law of agricultural biobiography is the basis of agricultural semiconductor lighting. As a new research field, the international start late, there are still many scientific problems to be solved. In summary, one of the scientific problems is photobiology. Here, we refer to the types of photoliths that act on living things, including visible light, UV and far-red light. (1) biological functions of photonics. The main research contents include understanding the physiological metabolism, molecular biology and proteomics mechanism of single and complex light quality on the growth, development, yield and quality of plants and edible fungi. (2) biological species and the mechanism of light quality adaptability and utilization difference between species; (3) biological mechanism of interaction between light quality and other environmental factors; (4) the effective threshold and reference value of quantity attribute of biological light quality in the facility (such as compensation point, saturation point and light stress threshold). Another scientific problem is photobiology of stress. This paper mainly studies the response mechanism and agronomic significance of photosynthetic mechanism and metabolic system under monochromatic and complex light weak light strong light and continuous light.
No matter from the perspective of promoting modern agricultural development or realizing energy conservation and environmental protection, LED application in agriculture is of great significance, and the status and development demand of agriculture also provide development opportunities for LED.
Domestic agricultural lighting has begun to use LED, such as the establishment of some agricultural demonstration areas of solar photovoltaic LED plant plants. In addition to some applications, LED applications in agriculture related technology research and development is also increasingly concerned. In December 2010, "plant factory" innovation conference held at the Chinese academy of agricultural sciences, Chinese academy of agricultural sciences belongs to high-tech enterprise launched a home and family gardening plant factory series products, and signed a strategic cooperation agreement with dozens of international well-known enterprise, is the LED lighting source plants, industrial control, air conditioning environment control, nutrient solution preparation in areas such as technology innovation, market development, such as agreement, signed a strategic alliance. The press conference not only marks the official birth of the first domestic plant version, but also indicates the formation of a strategic alliance of plant research and development.
In addition, with the development of LED technology, the United States, Japan, South Korea and other countries have taken LED agricultural lighting application as an important development direction, actively layout. Many manufacturers at home and abroad have entered into agricultural lighting, LED in the field of agricultural lighting competition is quietly going on.