Abstract
The objective of this study was to investigate the growth characteristics of sowthistle (Ixeris dentata Nakai) under different levels of light intensity (photosynthetic photon flux, PPF), electrical conductivity (EC) of nutrient solution, and planting density for efficient production in a closed-type plant factory system. Growth and yield of the plants were analyzed at EC 1.5 and 2.0 dS·m−1 with PPF 100 and 200 μmol·m−2·s−1. Further, growth and yield were measured under four different planting densities: a 15-cm between-row distance with within-row distances of 10, 15, 20, and 25 cm. Shoot dry weight and leaf photosynthetic rate all increased with increasing EC and light intensity. Shoot fresh and dry weights, chlorophyll content, and leaf photosynthetic rate were maximal at EC 2.0 dS·m−1 with PPF 200 μmol·m−2·s−1. For all planting densities, number of leaves and leaf width were not significantly different. Shoot fresh and dry weights per plant were not significantly different, however, shoot fresh and dry weights per area decreased with increasing plating densities. A linear relationship was observed between the number of leaves and days after transplantation. Based on the results, we suggest a nutrient solution of EC 2.0 dS·m−1, PPF 200 μmol·m−2 · s−1, and planting density of 15×10 cm for maximal growth and yield of sowthistle in a closed-type plant factory.
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Literature Cited
Cho, Y.Y. and J.E. Son. 2007. Estimation of leaf number and leaf area of hydroponic pak-choi plants (Brassica campestris spp. chinensis) using growing degree-days. J. Plant Biol. 50:8–11.
Choi, J.S., H.S. Young, and B.W. Kim. 1990. Hypoglycemic and hypolipemic effects of Ixeris dentate in diabetic rats. Arch. Pharm. Res 13:269–273.
Choi, K.Y. and Y.B. Lee. 2001. Effect of electrical conductivity of nutrient solution on tipburn incidence of lettuce (Lactuca sativa L.) in a plant factory using an artificial light source. J. Kor. Soc. Hort. Sci. 42:53–56 (in Korean).
Goudriaan, J. and J.L. Monteith, 1990. A mathematical function for crop growth based on light interception and leaf area expansion. Ann. Bot. 66:695–701.
Hong, S.G., D.M. Jeong, K.Y. Kim, and E.H. Hwang. 2010. The composition of the root of Ixeris dentata var. albiflora Nakai. and cell viability and DPPH radical scavenging activities of its extract. Kor. J. Nutr. 43:105–113 (in Korean).
Ikeda, A., Y. Tanimura, K. Ezaki, Y. Kawai, S. Nakayama, K. Iwao, and H. Kageyama. 1992. Environmental control and operation monitoring in a plant factory using artificial light. Acta Hort. 304: 151–158.
Kim, J.H., M.S. Sung, I.S. So, and H.N. Hyun. 2007. Study on the distribution and utilization of basalt underground air in Jeju volcanic island. Kor. J. Hort. Sci. Technol. 25(Suppl. II):113. (Abstr.)
Kim, M.J., J.S. Kim, D.M. Jeong, S.S. Ham, and C.Y. Yu. 2002. Effect of antioxidant, antimutagenicity and anticancer of root extract from Ixeris dentata Nakai. Korean J. Medicinal Crop Sci. 10:222–229 (in Korean).
Lee, E. 2011. Effects of Ixeris dentata ext. on lowering lipid and anti-oxidation. Korean J. Plant Res. 24:55–60 (in Korean).
McMaster, G.S. and W.W. Wilhelm. 1997. Growing degree-days: One equation, two interpretations. Agr. Forest Meteorol. 87:291–300.
Murdoch, D. 1997. Cornel CEA grower’s handbooks. http://www.bee.conrnel.edu/extension/cea/handbook_home.html.
Park, M.H. and Y.B. Lee. 1999a. Effects of CO2 concentration, light intensity and nutrient level on the growth of leaf lettuce a plant factory. J. Kor. Soc. Hort. Sci. 40:431–435.
Park, M.H. and Y.B. Lee. 1999b. Effects of light intensity and nutrient level on the growth and quality of leaf lettuce a plant factory. J. Bio-Env. Con. 8:108–114.
Reiners, S. and D.I.M. Riggs. 1999. Plant population affects yield and fruit size of pumpkin. HortScience 34:1076–7078.
Qin, L., S. Guo, W. Ai, and Y. Tang. 2008. Selection of candidate salad vegetables for controlled ecological life support system. Adv. Space Res. 41:768–772.
Um, Y.C., S.S. Oh, J.G. Lee, S.Y. Kim, and Y.A. Jang. 2010. The development of container-type plant factory and growth of leafy vegetables as affected by different light sources. J. Bio-Env. Con. 19:333–342 (in Korean).
Yoon, C.G. and H.K. Choi. 2011. A study on the various light source radiation conditions and use of LED illumination for plant factory. J. KIIEE 25(10):14–22.
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Cho, Y.Y., Choi, K.Y., Lee, YB. et al. Growth characteristics of sowthistle (Ixeris dentata Nakai) under different levels of light intensity, electrical conductivity of nutrient solution, and planting density in a plant factory. Hortic. Environ. Biotechnol. 53, 368–372 (2012). https://doi.org/10.1007/s13580-012-0691-1
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DOI: https://doi.org/10.1007/s13580-012-0691-1