The effect of light on plant growth

November 17, 2022

As a new external signal, light can affect many aspects of development, from seed germination, deetiolation to vegetative form, and the establishment of circadian rhythm. Plants produce organic matter through photosynthesis to provide materials and energy for their growth and development, so light is also the source of energy for plants. Light intensity, photoperiod, and spectral distribution make up the lighting environment within a facility. Under low-light conditions, the proportion of far-red light increased, and the proportion of red, blue and ultraviolet light decreased.

These changes are likely to form a light signal for the growth disorder of fruit and vegetable crops. The supplementary light is used to flexibly adjust the lighting environment in the facility, overcoming the limitations of the light source brought by the facility itself and weather conditions. The effective wavelength range of plant photosynthesis is 380-710nm. Among them, chlorophyll has the strongest spectral absorption of red light and blue-violet light. Studies have shown that red light promotes cell elongation, while blue light has the opposite effect. Long-wavelength light (red light) can significantly increase the development rate of various organs of plants. The most significant effect is to cause plants to bloom and bear fruit in advance; short-wavelength light (blue light) can inhibit the elongation of stems, prevent leggy growth, and promote vegetative organs. growth. The red and blue combined LED fill light can make up for the shortage of each monochromatic light source, and the light energy utilization rate is as high as 80% to 90%, and the energy saving effect is remarkable.

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