The sensitivity of plants to the spectrum is different from that of human eyes. The most sensitive spectrum for the human eye is 555 nm, between yellow-green light. The sensitivity to the blue and red regions is poor. Plants are not the most sensitive to the red light spectrum and less sensitive to green light, but the difference in sensitivity is not as disparate as the human eye. Plants are most sensitive to the spectrum from 400 to 700 nm. This section spectrum is often called the photosynthesis effective energy region. About 45% of sunlight's energy is located in this section of the spectrum. Therefore, if an artificial light source is used to supplement the amount of light, the spectral distribution of the light source should also be close to this range. The photon energy emitted by the light source differs depending on the wavelength. For example, the energy at a wavelength of 400 nm (blue light) is 1.75 times the energy of 700 nm (red light). Through the measurement of the plant photosynthetic apparatus, it was found that for the photosynthesis, the results of the two wavelengths are the same. The excess energy in the blue spectrum that cannot be used as photosynthesis is converted into heat.
In other words, the plant photosynthesis rate is determined by the number of photons absorbed by plants in the range of 400-700 nm, and is not related to the number of photons emitted by each spectrum. However, common people think that light color affects the rate of photosynthesis. Plants have different sensitivities for all spectra. This reason comes from the special absorption of pigments in the leaves. Among them, chlorophyll is the best known. However, chlorophyll is not the only useful pigment for photosynthesis. Other pigments are also involved in photosynthesis, so photosynthetic efficiency cannot be considered only by the absorption spectrum of chlorophyll. The dissimilarity of photosynthesis pathways is also not related to color. Measurements by plant photosynthesis assays have found that light energy is absorbed by chlorophyll and carotene in the leaves. Energy is converted into glucose and oxygen by immobilizing water and carbon dioxide through two photosynthetic systems. This process uses the spectrum of all visible light, so light sources of various colors have almost no effect on photosynthesis.
Through the detection of plant photosynthesis meters and other related instruments, it was found that plants should receive various balanced light sources for the morphological development of the plants and the color of the leaves. Blue light sources (400-500 nm) are important for plant differentiation and stomatal regulation. If there is insufficient blue light, the proportion of far-red light is too much, the stem will grow excessively, and it is easy to cause yellowing of the leaves. The ratio of red light spectrum (655~665nm) energy to far red light spectrum (725~735nm) energy is between 1.0 and 1.2, and the development of plants will be positive. However, the sensitivity of each plant to these spectral proportions is also different. In natural sunlight, blue light energy accounts for 20%. For artificial light sources, such a high ratio is not required. For normally-developed plants, most plants require only 6% of the blue light energy in the 400-700nm range. In natural sunlight, this is already enough blue energy. Therefore, artificial light sources do not need to be supplemented with more blue light spectrum. However, when the natural light source is insufficient (such as winter), the artificial light source needs to increase the blue light energy, otherwise the blue light source will become a limiting factor for plant growth. However, if there is no light source improvement method, there are still other ways to remedy this problem. For example, temperature adjustment or application of growth hormones.
In other words, the plant photosynthesis rate is determined by the number of photons absorbed by plants in the range of 400-700 nm, and is not related to the number of photons emitted by each spectrum. However, common people think that light color affects the rate of photosynthesis. Plants have different sensitivities for all spectra. This reason comes from the special absorption of pigments in the leaves. Among them, chlorophyll is the best known. However, chlorophyll is not the only useful pigment for photosynthesis. Other pigments are also involved in photosynthesis, so photosynthetic efficiency cannot be considered only by the absorption spectrum of chlorophyll. The dissimilarity of photosynthesis pathways is also not related to color. Measurements by plant photosynthesis assays have found that light energy is absorbed by chlorophyll and carotene in the leaves. Energy is converted into glucose and oxygen by immobilizing water and carbon dioxide through two photosynthetic systems. This process uses the spectrum of all visible light, so light sources of various colors have almost no effect on photosynthesis.
Through the detection of plant photosynthesis meters and other related instruments, it was found that plants should receive various balanced light sources for the morphological development of the plants and the color of the leaves. Blue light sources (400-500 nm) are important for plant differentiation and stomatal regulation. If there is insufficient blue light, the proportion of far-red light is too much, the stem will grow excessively, and it is easy to cause yellowing of the leaves. The ratio of red light spectrum (655~665nm) energy to far red light spectrum (725~735nm) energy is between 1.0 and 1.2, and the development of plants will be positive. However, the sensitivity of each plant to these spectral proportions is also different. In natural sunlight, blue light energy accounts for 20%. For artificial light sources, such a high ratio is not required. For normally-developed plants, most plants require only 6% of the blue light energy in the 400-700nm range. In natural sunlight, this is already enough blue energy. Therefore, artificial light sources do not need to be supplemented with more blue light spectrum. However, when the natural light source is insufficient (such as winter), the artificial light source needs to increase the blue light energy, otherwise the blue light source will become a limiting factor for plant growth. However, if there is no light source improvement method, there are still other ways to remedy this problem. For example, temperature adjustment or application of growth hormones.
We are a profession manufacturer of robot and machines serving fully or semi. automatic Hardware Production Line.
Provide process automation solutiions of hardware industry. Our company has high-quality and rich experienced R*D team to design robot to match machines and processing procedures. Your requirement from mechnical, software, circuit pneumatic system, PLC, Cad, 3D mode will be completely satisfied based on the anaylysis of actual production condition in your factory.
It present you the fully automatic and safe working labels in the dangerous and harmful situations, to be combined into production according to different products and procedures.
Stainless Steel Hardware Processing Machine
Hardware Production Line,Cookware Processing Machine,Semi-Automatic Kitchenware Combine Machine
Shantou Sunshine Automation Equipment Co.,Ltd. , http://www.stjsrobot.com