The most sensitive visible light band of plants is the physiological absorption peak of chlorophyll a and chlorophyll b, namely, 660 nm red light and 454 nm blue light (MeCree, 1972). The regulation of spectral combination of this band on the absorption of mineral elements in lettuce root has not been reported yet. Factors such as the density difference of cultivation substrate, salt residue in the substrate and uneven distribution of mineral nutrients may affect the accuracy of the test results.
Therefore, the combined red and blue LED light sources with wave peaks of 660 nm and 454 nm were used in the closed plant factory to further explore the influence of the combined spectral components on the absorption and accumulation of minerals in lettuce, in order to provide theoretical basis for the production of functional vegetables in the plant factory and the adjustment of nutrient solution formula under different light formulas. Light source and nutrient solution are the energy and material sources of mineral nutrients in soilless vegetables, and they play an important role in the absorption process of minerals.
Chen Xiaoli (2014) studied the absorption of K, P, Ca, Mg, Na, Fe, Mn, Zn, Cu, B, Mo by hydroponic lettuce under fluorescent lamp and eight kinds of red and blue LED compound light sources (peak wavelength and half wavelength are 660nm and 450nm respectively).
Chen Xiaoli (2013) showed that the broad-band red light emitted by fluorescent lamps and the narrow-band red light emitted by LEDs significantly promoted the absorption of Fe and Cu elements in lettuce, while the accumulation of eight mineral elements such as K, P, Ca, Mg, Na, Mn, Zn, Cu and B reached the maximum under the treatment of LED light R (632nm)/B (460nm) 1:2. Chen Xiaoli (2014) found that the content of seven mineral elements in the 660nm single red spectrum reached the maximum, but the lowest biomass of lettuce under this spectral condition led to the smallest accumulation of some elements. In the 660nm and 450nm red-blue combination spectrum, when the blue light amount was 20%, the accumulation of seven elements Ca, Mg, Na, Fe, Mn, Zn, B in lettuce was the largest.
Light environment regulation of mineral element absorption
The most sensitive visible light band of plants is the physiological absorption peak of chlorophyll a and chlorophyll b, namely, 660 nm red light and 454 nm blue light (MeCree, 1972). The regulation of spectral combination of this band on the absorption of mineral elements in lettuce root has not been reported yet. Factors such as the density difference of cultivation substrate, salt residue in the substrate and uneven distribution of mineral nutrients may affect the accuracy of the test results.
Therefore, the combined red and blue LED light sources with wave peaks of 660 nm and 454 nm were used in the closed plant factory to further explore the influence of the combined spectral components on the absorption and accumulation of minerals in lettuce, in order to provide theoretical basis for the production of functional vegetables in the plant factory and the adjustment of nutrient solution formula under different light formulas. Light source and nutrient solution are the energy and material sources of mineral nutrients in soilless vegetables, and they play an important role in the absorption process of minerals.
Chen Xiaoli (2014) studied the absorption of K, P, Ca, Mg, Na, Fe, Mn, Zn, Cu, B, Mo by hydroponic lettuce under fluorescent lamp and eight kinds of red and blue LED compound light sources (peak wavelength and half wavelength are 660nm and 450nm respectively).
Chen Xiaoli (2013) showed that the broad-band red light emitted by fluorescent lamps and the narrow-band red light emitted by LEDs significantly promoted the absorption of Fe and Cu elements in lettuce, while the accumulation of eight mineral elements such as K, P, Ca, Mg, Na, Mn, Zn, Cu and B reached the maximum under the treatment of LED light R (632nm)/B (460nm) 1:2. Chen Xiaoli (2014) found that the content of seven mineral elements in the 660nm single red spectrum reached the maximum, but the lowest biomass of lettuce under this spectral condition led to the smallest accumulation of some elements. In the 660nm and 450nm red-blue combination spectrum, when the blue light amount was 20%, the accumulation of seven elements Ca, Mg, Na, Fe, Mn, Zn, B in lettuce was the largest.