Light-Emitting Diodes (LEDs) for Miniature Hydroponic Lettuce

DOI: 10.4236/opj.2013.31012   PDF   HTML   XML   8,618 Downloads   14,294 Views   Citations


There is growing concern about food safety, environmental impact, and efficient energy usage in agricultural production systems. Producing lettuce under artificial lighting could be a solution addressing these concerns. Light-emitting diodes (LEDs) offer the advantages of a narrow light spectrum, low power consumption, and little heat production. The objective of this study was to determine the effects of different light sources on the growth of miniature “Tom Thumb” butterhead lettuce in a non-circulating hydroponic system. Lettuce seedlings, started in Oasis Horticubes, were transferred to net pots in containers with a hydroponic nutrient solution. The lettuce was grown in a lab under three light treatments—blue LEDs, red LEDs, and fluorescent lights. At the end of the study, fluorescent lights resulted in greater root dry weight than blue LEDs and red LEDs. Total plant dry weight under fluorescent lights was greater than under red LEDs. There were no significant differences in shoot dry weight and plant height among the treatments. Percent partitioning of dry weight to shoots was greatest with red LEDs, followed by blue LEDS, and fluorescent lights. Percent partitioning of dry weight to roots was greatest with fluorescent lights, followed by blue LEDS, and red LEDs. Leaf chlorophyll content was greater under blue LEDs and fluorescent lights than red LEDs. The pH of the nutrient solution of the blue LED and the fluorescent light treatments were greater than the red LED treatment. Electrical conductivity of the nutrient solution of the fluorescent light treatment was greater than the blue LED treatment and the red LED treatment. In conclusion, LEDs could provide an alternative lighting source for miniature lettuce production.

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K. Kobayashi, T. Amore and M. Lazaro, "Light-Emitting Diodes (LEDs) for Miniature Hydroponic Lettuce," Optics and Photonics Journal, Vol. 3 No. 1, 2013, pp. 74-77. doi: 10.4236/opj.2013.31012.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] P. Pinho, K. Jokinen and L. Halonen, “Horticultural Lighting—Present and Future Challenges,” Lighting Research and Technology, Vol. 44, No. 4, 2012, pp. 427-437. doi:10.1177/1477153511424986
[2] E. Goto, “Plant Production in a Closed Plant Factory with Artificial Lighting,” Proceedings of the 7th International Symposium on Light in Horticultural Systems, Wageningen, 15-18 October 2012, pp. 37-50.
[3] H. Watanabe, “Light-Controlled Plant Cultivation System in Japan—Development of a Vegetable Factory Using LEDs as a Light Source for Plants,” Proceedings of the 6th International Symposium on Light in Horticulture, Tsukuba, 15-19 November 2009, pp. 37-44.
[4] B. A. Kratky, “A Suspended Net-Pot, Non-Circulating Hydroponic Method for Commercial Production of Leafy, Romaine, and Semi-Head Lettuce,” Vegetable Crops, VC-1, 2010, pp. 1-19.
[5] N. Domurath, F. G. Schroeder and S. Glatzel, “Light Response Curves of Selected Plants under Different Light Conditions,” Proceedings of the 7th International Symposium on Light in Horticultural Systems, Wageningen, 15-18 October 2012, pp. 291-298.
[6] E. G. Gonzalez, “LEDs for General and Horticultural Lighting,” Final Project, Aalto University, Aalto, 2012.
[7] G. D. Massa, H. H. Kim, R. M. Wheeler and C. A. Mitchell, “Plant Productivity in Response to LED Lighting,” HortScience, Vol. 43, No. 7, 2008, pp. 1951-1956.
[8] M. M. Mickens and R. M. Wheeler, “Comparative Study of Lettuce and Radish Grown under Red and Blue Light-Emitting Diodes (LEDs) and White Fluorescent Lamps,” Final Report, JPFP CBRE, Orlando, 2012.
[9] R. C. Morrow, “LED Lighting in Horticulture,” HortScience, Vol. 43, No. 7, 2008, pp. 1947-1950.
[10] L. Y. Chin and K. K. Chong, “Study of High Power Light Emitting Diode (LED) Lighting System in Accelerating the Growth Rate of Lactuca Sativa for Indoor Cultivation,” International Journal of Physical Sciences, Vol. 7, No. 11, 2012, pp. 1173-1781.
[11] M. Johkan, K. Shoji, F. Goto, S. Hashida and T. Yoshihara, “Blue Light-Emitting Diode Light Irradiation of Seedlings Improves Seedling Quality and Growth after Transplanting in Red Leaf Lettuce,” HortScience, Vol. 45, No. 12, 2010, pp. 1809-1814.
[12] N. C. Yorio, G. D. Goins, H. R. Kagie, R. M. Wheeler and J. C. Sager, “Improving Spinach, Radish, and Lettuce under Red Light-Emitting Diodes (LEDs) with Blue Light Supplementation,” HortScience, Vol. 36, No. 2, 2001, pp. 380-383.
[13] H. Shimizu, Y. Saito, H. Nakashima, J. Miyasaka and K. Ohdoi, “Light Environment Optimization for Lettuce Growth in Plant Factory,” Proceedings of the International Federation of Automatic Control, Milano, 28 August-2 September 2011, pp. 605-609.
[14] K. Ohashi-Kaneko, M. Takase, N. Kon, K. Fujiwara and K. Kurata, “Effect of Light Quality of Growth and Vegetable Quality in Leaf Lettuce, Spinach, and Komatsuna,” Environmental Control in Biology, Vol. 45, No. 3, 2007, pp. 189-198. doi:10.2525/ecb.45.189
[15] Q. Li and C. Kubota, “Effects of Supplemental Light Quality on Growth and Phytochemicals of Baby Leaf Lettuce,” Environmental and Experimental Botany, Vol. 67, No. 1, 2009, pp. 59-64. doi:10.1016/j.envexpbot.2009.06.011

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