Institute of Agricultural Science and Technology, Kyungpook National University1
Department of Horticultural Science, Wonkwang University2
This research was carried out to investigate the effect of supplemental lighting on stable productivity of paprika (Capsicum annuum L.) during low radiation period of winter season. The supplemental lighting sources used in this research were high pressure sodium (HPS) and lighting emitting plasma (LEP). Photosynthetic photon flux density (PPFD) emitted from both lamps decreased as vertical distance from lamp increased. The PPFD of LEP lamps were twice more than that of the HPS lamp per unit distance, but the rate of decreased PPFD of the LEP per unit distance was higher than that of HPS lamp. And different degrees of PPFD between HPS and LEP lamps by horizontal distance had a smaller degree of difference than by vertical distance at the 100 cm away point. As daily average PPFD measured at the top of the plant under the supplemental lighting during January, the supplemental lighting significantly increased radiation. Radiation of HPS and LEP lighting was 137% and 315% higher than control (without supplemental lighting = sunlight). Air temperature in the top of the plant was not significant different among treatments. HPS and LEP lighting had no effect on increase of flower settings. Leaf length and width with LEP lighting was the longest, photosynthetic was higher than those of other treatments. Supplemental lighting treatments significant increased fruit length and diameter. Especially LEP lighting treatment had a greater effect on fruit length and diameter. In conclusion, LEP lighting treatment during low radiation period greatly affected growth and production of paprika. Further research will be required for the suitable application of LEP lighting in paprika production.
1. An, C.G., Y.H. Hyeon, H.S. Yoon, J.U. An, Y.H. Chang, G.M. Shon, and C.W. Rho. 2011. Effect of LED (light emitting diodes) irradiation on fruiting of paprika. Kor. J. Hort. Sci. Technol. 29(Suppl. I):70. (Abstr.)
2. Choi, Y.W. 2003. Effect of red, blue, and far-red LEDs for night break on growth, flowering, and photosynthetic rate in Perilla ocymoides. J. Kor. Soc. Hort. Sci. 44:442-446.
3. Dorais, M. 2003. The use of supplemental lighting for vegetable crop production: Light intensity, crop response, nutrition, crop management, cultural practices. Can. Greenhouse Conference, October 9, 2003. p. 1-8.
4. Han, S.J. 2012. Effect of supplemental LED lighting on growth, yield and fruit components of sweet pepper (Capsicum annuum L.). Ph.D Diss., Chonbuk Natl. Univ., Jeonju, Korea.
5. Hao, X. and A.P. Papadopoulos. 1999. Effects of supplemental lighting and cover materials on growth, photosynthesis, biomass partitioning, early yield and quality of greenhouse cucumber. Sci. Hort. 80:1-18.
6. Jeong, W.J., D.J. Myung, and J.H. Lee. 2009. Comparison of climatic conditions of sweet pepper’s greenhouse between Korea and the Netherlands. J. Bio. Environ. Con. 18:244-252.
7. Korea Agricultural Trade Information (KATI). 2013. The state of paprika industry in Korea. Korea Agro-Fisheries Trade Corporation, Seoul, Korea.
8. Kwon, J.H., J.S. Park, Y.I. Kang, and H.G. Choi. 2011. Effect of LED light source and intensity on growth and quality of greenhouse grown tomato. Kor. J. Hort. Sci. Technol. 29 (Suppl. II):74. (Abstr.)
9. Lee, M.S. 2012. Effects of various artificial light sources on growth and flowering in Begonia xhiemalis and Pelargonium crispum. Master’s thesis, Yeungnam Univ., Gyeongsan, Korea.
10. Wijgerde, T., H. Peter, and R. Osinga. 2012. Effects of irradiance and light spectrum on growth of the scleractinian coral Galaxea fascicularis - Applicability of LEP and LED lighting to coral aquaculture. Aquaculture 344-349:188-193.