Optimization of supplemental light research of LED lights used in plant growth chambers for lettuce cultivating
| Autor: | Meng-Lin Tsai, 蔡孟霖 |
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| Rok vydání: | 2015 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 103 This study was planted lettuce in plant growth chamber with hydroponic system. Artificial lighting LED was supplied by solar power combined with city electricity. All environmental factors such as temperature, humidity, CO2 concentration, pH value of the nutrient solution, and EC values, etc. were controlled. With the supplemental light of different wavelengths of light given, morphology, fresh weight, dry weight, chlorophyll content, β-carotene content, and nitrates content etc. were measured. In lettuce physiology results, under the red supplemental light, the green romaine and red wrinkled leaf lettuce had the most number of leaves, 18 and 12 respectively. Green wrinkled leaf lettuce leaf number in the first 35 days of each treatment groups in the number of leaves were all 10. Green romaine lettuce and green wrinkled leaf lettuce had the highest plant height in blue supplemental lights, 21.9 and 20.0 cm respectively. Red wrinkled leaf lettuce had a better performance for height, 14.7 cm, in the red supplemental lights treatment. Green romaine and green wrinkled leaf lettuce grew fastly at 29 day after sowing. Green romaine lettuce had the best shoot fresh weight, 172 g, in red supplement lights. Red wrinkled leaf lettuce and green wrinkled leaf lettuce had the best shoot fresh weight in control groups, 4.31 and 6.44 g, respectively. All of three lettuces in control groups had better root dry weight that compared to other supplemental light treatments. Red wrinkled leaf lettuce under red supplemental lights and green wrinkled leaf lettuce under control groups seemed to utilize chlorophyll and carotenoid more efficiently. Red wrinkled leaf lettuce and green wrinkled leaf lettuce had more chlorophyll content in blue supplemental lights than others. In green romaine lettuce, nitrate content was the lowest in red supplemental lights though it had the heaviest shoot fresh weight that seemed red light enhanced the ability of metabolism of nitrate. In conclusion, red supplemental lights in lettuce physiology results was better for green romaine lettuce and green wrinkled leaf lettuce than other treatment. And red wrinkled leaf lettuce had better performance under in control group in this study. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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