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
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
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