Article | 02. 2016 Vol. 34, Issue. 1
Light Quality and Photoperiod Affect Growth of Sowthistle (Ixeris dentata Nakai) in a Closed-type Plant Production System



Department of Horticulture, Division of Applied Life Science (BK21 Plus Program), Graduate School of Gyeongsang National University1
Department of Horticulture, College of Agriculture & Life Sciences, Gyeongsang National University2
Institute of Agriculture & Life Sciences, Gyeongsang National University3




2016.02. 67:76


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This study was conducted to examine the optimal environmental condition for promoting the growth of sowthistle as affected by light quality and photoperiod in a closed-type plant production system. Seeds were sown in 240-cell plug trays and then germinated for 3 days at a 24-hour photoperiod in a closed-type plant production system with LED lights (R:B:W = 8:1:1). Seedlings were transplanted and grown under 3 types of LED (R:B:W = 8:1:1, R:W = 3:7, or R:B = 8:2) and 4 photoperiods (24/0, 16/8, 8/16, or 4/20 hours) with 230 μmolㆍm-2ㆍs-1 light intensity at a density of 20 cm × 20 cm. The experimental design was a randomized complete block design. Plants were cultured for 40 days un der the condition of 21 ± 2 ˳ C and 70 ± 10% relative humidity after transplanting. Plants were fed with a recycling nutrient solution (pH 7.0 and EC 2.0 dSㆍ m-1) contained in a deep floating tank. Fresh weight and dry weight of shoot or root, leaf length, and leaf area were the greatest in the photoperiod of 24/0 (light/dark) with RW LED. The highest number of leaves occurred in the photoperiod of 16/8 (light/dark) with RB LED, while the incidence of tip burn was higher in the photoperiod of 24/0 (light/dark) compared to the other treatments. Chlorophyll value was the highest in the 16/8 (light/dark) photoperiod and there was no significant difference by light quality. Chlorophyll fluorescence was the lowest in the photoperiod of 24/0 (light/dark) compared with other treatments. Therefore, in terms of economic feasibility and productivity for Ixeris dentata Nakai cultivation in a closed-type plant production system, the results obtained suggest that plants grew the best when kept in a photoperiod of 16/8 (light/dark) and light quality of combined LED RW (3:7).



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