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- W210337079 abstract "This study was conducted to examine the effect of supplemental lighting on the growth and yield of hydroponically grown sweet pepper (Capsicum annuum L. cv. sprit) under low levels of natural light in winter. The plants were treated with natural light only (control), 3-hour supplemental lighting before sunrise, after sunrise and after sunset with high pressure sodium (HPS, 400W). As the result of these three treatments, the supplemental lighting promoted photosynthesis in the low light intensity condition and particularly photosynthesis was more active right after sun rise in the morning, 1.5-3.0 μmolCO2·m -2 ·s -1 comparing to those of supplemental lighting after sunset, 0.5-1.5 μmolCO2·m -2 ·s -1 . Transpiration rate and stomatal conductance sharply increased with supplemental lighting after sunrise then they decreased again after turning the lights off. Stomatal size was observed 32.2 μm 2 after supplemental lighting, whereas the size of the natural light was almost closed at 7.7 μm 2 . The average plant height of sweet papper cv. spirit was 185 cm before sunrise, 188 cm after sunrise and 208 cm after sunset with supplemental lighting for 3hours while the control was 171 cm. With supplemental lighting a better number of fruit set per plant was measured 4.3 before and after sunrise, 3.7 after sunset but 2.6 in the control. Interestingly, there were no significant differences in the sugar content (°Brix) degree between treatment of supplemental lighting, whereas slight differences between seasons were seen. The marketable fruit yield of sweet pepper (cv. spirit) was 116.0 kg·ha with supplemental lighting, whereas the control (natural light only) was 75.8 kg·ha. Despite of spending electricity and depreciation cost, the economic analysis showed net income with supplemental lighting after sunrise was 51% higher than control treatment in cv. spirit." @default.
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- W210337079 date "2011-01-01" @default.
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- W210337079 title "Effects of supplemental lighting on growth and yield of sweet pepper (Capsicum annuum L.) in hydroponic culture under low levels of natural light in winter." @default.
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