Effects of Far-red Light on the Growth and Qualities of Lettuce in Plant Factory

doi:10.3969/j.issn.1000-6362.2017.05.004

Abstract

Abstract: The experiment was carried out in a closed plant factory, where white light irradiation for 12h (0：00-12：00) was used as the basal light to ensure the normal growth of lettuce. Two kinds of LED far-red light (peak at 850nm and 930nm) were used as supplemental light. Three modes of far-red light that were respectively semi-overlapped(S), overlapped(O) and non-overlapped(N) relative to the basal white light were applied by adjusting the on and off time of far-red light. That was, six treatments which were respectively Fr930S, Fr850S, Fr930O, Fr850O, Fr930N, and Fr850N had been examined in the study. The light intensity, lighting period as well as the electric energy consumption were the same among treatments. The growth and nutritional qualities of lettuce were measured in order to analyze the effects of different?far-red light as well as to determine the best supply mode of far-red light. The results showed that: (1) different modes of far-red light with the same peak wavelength resulted in various influence on the growth and quality of lettuce. Meanwhile, different peak wavelengths of far-red light with the same supply mode also caused discrepancies in the growth and quality of lettuce. (2) Among the six light treatments, the fresh weight of shoot was the highest under 850nm far-red light with non-overlapped mode; The crude protein and soluble sugar content were both the highest under 850nm far-red light with semi-overlapped mode; The highest vitamin C content as well as the lowest nitrate content were both detected under 930nm far-red with non-overlapped mode. Therefore, during the practical production, based on the same energy consumption, people can choose and adjust the wavelength and supply modes of far-red light according to different productive purposes.

Key words: LED, Plant factory, Lettuce, Far-red light, Nutritional quality

MA Tai-guang,CHEN Xiao-li,GUO Wen-zhong,LI Ling-zhi,LI Hai-ping. Effects of Far-red Light on the Growth and Qualities of Lettuce in Plant Factory[J]. Chinese Journal of Agrometeorology, 2017, 38(05): 301-307.

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