1.Guangdong -Hong Kong-Macao Joint Laboratory of Intelligent Micro-Nano Optoelectronic Technology/School of Physics and Optoelectronic Engineering, Foshan University of Science and Technology, Foshan 528225, China
2.School of Food Science and Engineering, Foshan University of Science and Technology, Foshan 528225, China
3.Ministry of Agriculture and Rural Affairs, lnstitute of Environment and Sustainable Development in Agriculture/Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures of Ministry of Agriculture and Rural Affairs, Chinese Academy of Agricultural Sciences, Beijing 100081, China
4.Foshan Haolaite Optoelectronics Co. , Ltd. , Foshan 528000, China
The aim of this study was improving the seedling index and physiological indicaters of tomato in plant factory. To explore the effects of side supplementary lighting with far-red and green light on the growth quality of hydroponic dwarf red tomato seedlings, Jingyan tomato was used as the research object. The ratio of red and blue light of the LED light lamps from the top lighting was set as 3 to 1. The red light wavelength was (660±10) nm, the blue light wavelength was (450±10) nm, and the light intensity (PPFD) was 250 μmol/(m2·s), with the photoperiod of 14 h/10 h. Seven treatments were set up, which were no lateral lighting supplement (CK), green light unilateral lighting supplement (Gu), far red light unilateral lighting supplement (Fu), green light+far red light unilateral lighting supplement (GFu), green light bilateral lighting supplement (Gb), far red light bilateral lighting supplement (Fb), and green light+far red light bilateral lighting supplement (GFb). Tomato seedlings were harvested after 47 days, and the growth index and physiological index parameters of tomato seedlings under each treatment were determined. The results showed that: compared with CK group, the stem diameter, aboveground dry weight, underground dry weight and strong seedling index of dwarf red tomato treated with Fb increased, and the strong seedling index 2 increased by 33.6%; The growth indexes of tomato under Gu and Gb treatments decreased significantly, and the strong seedling index 1 of GB treatment decreased by 53.1%; The Gu and Gb treatments with green light supplementation increased the chlorophyll content of dwarf red tomatoes, while the far red light supplementation treatment of Fu and Fb significantly reduced the chlorophyll content of dwarf red tomatoes; Green light supplementation with Gu and Gb significantly reduced the nitrate nitrogen content in dwarf red tomatoes, while green or far red light supplementation significantly increased the soluble protein content in the leaves of dwarf red tomato. In summary, the green light supplementation inhibits the growth of dwarf red tomato seedlings, while far red light promotes the growth. The bilateral supplementation has stronger effect than unilateral supplementation, and far red light with bilateral supplementation has the best promoting effect.
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