Published by adminJan 13,2021
Different light qualities or wavelengths of light have significantly different biological effects, including different effects on the morphological structure and chemical composition of plants, photosynthesis, and organ growth and development. Red light Red light generally inhibits internode elongation of plants, promotes tillering, and increases the accumulation of chlorophyll, carotenoids, soluble sugars and other substances. Red light can promote the growth of leaf area and β-carotene accumulation of pea seedlings; lettuce seedlings are pre-irradiated with red light and then applied with near-ultraviolet light. It is found that red light can enhance the activity of antioxidant enzymes and increase the content of near-ultraviolet absorption pigments, thereby reducing near-ultraviolet light. Ultraviolet light damages lettuce seedlings; full-light experiments on strawberries found that red light is beneficial to increase the content of organic acids and total phenols in strawberries...
Published by adminJan 08,2021
Light distribution plan 1—discontinuous wavelength red + blue collocation The wavelength of general plant growth supplement light is 660nm (plant red light) + 450nm (plant blue light), two simple wavelength combinations. The ratio is set according to different plants. Generally speaking, the ratio of red light is relatively more. a. Flowering and fruiting type, the ratio of red light is higher, usually the ratio of red to blue is 7-12:1 b. Leaf and rhizome plants, the ratio of red light is relatively low, usually the ratio of red to blue is 15:1 Advantage: 1. Different ratios of red and blue can be designed with universal applicability. 2. The spectrum matching scheme is simple, and the circuit design is relatively simple. 3. The efficiency is medium and the yield is low. Disadvantages: 1. When the solution is used in linear plant lights, the light mixing is uneven. 2. Compared with the full spectrum solution, the elect...
Published by adminJan 07,2021
Two major effects of 730nm far-red LED on plants 1. 730nm far-red light's shade avoidance effect One of the most important effects of 730nm far-red light illumination on plants is shade avoidance (Figure 3). If the plant is only irradiated by the deep red light of 660nm, the plant will feel that it is under direct sunlight and grow normally. And if the plant is mainly irradiated by the far-red light of 730nm, the plant will feel as if it is blocked by another taller plant from the direct light of the sun, so the plant will grow harder to break through the obscuration. Helping plants grow taller, but it does not necessarily mean there will be more biomass (bio mass). 2. Flower inducing effect of 730 nm far-red light Another important role of 730nm far-red light in horticultural lighting applications is that the flowering cycle can be controlled by 660nm and 730nm lighting, without relying only on the influence of seasons, which has important value for ornamental flowers. The convers...
Published by adminJan 06,2021
Light has a particularly important position in the growth and development of plants, and it affects almost all growth stages of plants. The effects of light on plants are mainly manifested in two aspects: One is to provide radiant energy for plant photosynthesis. The second is as a signal to regulate many physiological processes throughout the life cycle of plants. The effect of light on plant growth-photosynthesis and phytochrome Generally, the growth and development of plants rely on sunlight, but the factory production of vegetables, flowers and other economic crops, tissue culture, and the propagation of test-tube seedlings also require supplementary light from artificial light sources to promote photosynthesis. Photosynthesis refers to the process by which green plants use light energy through chloroplasts to convert carbon dioxide and water into organic matter that stores energy and release oxygen. The key participant in this process is the chloroplast inside the plant cell. U...
