LED绿光补光模式对生菜生长及品质的影响

doi:10.3864/j.issn.0578-1752.2017.21.011

Abstract

Abstract: 【Objective】 To explore the better mode of green LED light supply in plant factories, the effects of different modes of green light on the growth and nutrient quality of lettuce were analyzed.【Method】Lettuce was grown in the fully artificial light plant factory, where adjustable white and green LED panels were used as the sole light source for lettuce growth. White light (W) provided at 8:00-20:00 (160 μmol·m^-2·s^-1) was regarded as the basal light for normal growth of lettuce, and green light (G) at different intensity (30, 60, and 90 μmol·m^-2·s^-1) was supplied as the supplemental light. Meanwhile, overlapping mode (O) and non-overlapping mode (N) of the basal white light and the green light were set by regulating the green light time. Treatments were recorded as W, WG₃₀O, WG₆₀O, WG₉₀O, WG₃₀N and WG₉₀N, and the green light period for all treatments was 6 h. 【Result】 All treatments were observed to enhance the shoot fresh weight of lettuce compared with the control except treatment of WG₉₀N, 30 μmol·m^-2·s^-1low intensity of supplemental light was more beneficial for the growth and biomass accumulation of lettuce. Supplemental green light promoted the accumulation of soluble sugar, crude protein and vitamin C at different levels, and decreased the nitrate content at the same time. Among which, the soluble sugar, crude protein and Vc contents increased with the increase of green light intensity. Green light depended on the exist of basal white light on the biomass accumulation of lettuce, but the green light didn’t show the dependent on the basal white light on the process of the soluble sugar and vitamin C. 【Conclusion】 The effects of green light supply are relevant to the light intensity as well as the supply modes. Green lighting strategy can be established and adjusted according to the production purpose in the actual production.

Key words: plant factory, LED, green light, white light, lettuce

CHEN XiaoLi, YANG QiChang, ZHANG Xin, MA TaiGuang, GUO WenZhong, XUE XuZhang. Effects of Green LED Light on the Growth and Quality of Lettuce[J].Scientia Agricultura Sinica, 2017, 50(21): 4170-4177.

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