Jeollabuk-do Agricultural Research and Extension Services1
This experiment was carried out to investigate the effects of shading materials (aluminum specific-shading screen and polypropylene non-woven fabric) and shading ratio (50% and 70%) on climatic changes, cut-flower quality, and yield of spray rose cultivars for export during high temperature periods. The daily cumulative solar radiations were higher with the aluminum specific-shading screen, especially with 50% shading compared to polypropylene non-woven fabric. Air temperature and root zone temperature within rockwool media greatly decreased with the aluminum specific-shading screen, but relative air humidity was not different among shading methods. Chlorophyll contents (SPAD values) were slightly higher with aluminum-specific shading screen than with polypropylene non-woven fabric, and were higher with 50% than with 70% aluminum specific-shading screen. Except for ‘Lovely Lydia’, marketable and exportable yields of all cultivars were higher with 50% than with 70% aluminum shading treatment. In addition, flower stalk length, stem diameter, number of node and 7ea-leaflet, and floret number tended to be better with aluminum specific-shading screen. Flower stalk length was higher with 70% than with 50% aluminum shading treatment. Chromaticity of petals slightly increased, and vase life was 0.5-2.5 days longer for each cultivar with aluminum specific-shading screen than with polypropylene non-woven fabric.
1. Brand, M.H. 1997. Shade influences plant growth, leaf color, and chlorophyll content of Kalmia latifolia cultivar. HortScience 32:206-208.
2. Bredmore, N. 1997. Chronology of three physiological development phases of single-stemmed rose (Rosa hybrida) plants in response to increment in light quantum integral. Sci. Hortic. 69:107-115.
3. Cheong, D.C., C.H. Choi, H.C. Lim, Y.J. Song, J.M. Jeong, and J.J. Lee. 2012. Cut flower productivity of new bred spray rose cultivars as affected by environmental control of cultivation facilities in Korea. Flower Res. J. 20:187-192.
4. Cheong, D.C., H.C. Lim, H.B. Park, and Y.J. Song. 2005. Effects of shading period and level on growth and flowering of Gypsophila paniculata. Kor. J. Hort. Sci. Technol. 23:433-439.
5. Cheong, D.C., H.C. Lim, Y.J. Song, and H.B. Park. 2008. Growth of Gypsophila paniculata according to the differential pruning time and ridge position in subalpine area. Kor. J. Hort. Sci. Technol. 26:234-237.
6. Cheong, D.C., Y.J. Song, J.J. Lee, C.H. Choi, and H.J. Kim. 2013. Climatic environment, cut-flower quality and productivity as affected by cultivation facilities of exporting rose. Kor. J. Hort. Sci. Technol. 31:149. (Abstr.)
7. Chun, H., H.W. Kim, and S.Y. Lee. 2002. Effect of temporary shading on greenhouse environment and cut rose quality in summer. Kor. J. Hort. Technol. 20:110. (Abstr.)
8. Hong, C.K., S.B. Bang, and J.S. Han. 1996. Effects of shading net on growth and yield of Aster scaber Thunb. and Ligularia fischeri Turez. RDA. J. Agri. Sci. 38:462-467.
9. Hoog, J. D. 2001. Handbook for modern greenhouse rose cultivation, p. 147-156. In: Applied plant research. Netherlands.
10. Kim, W.S., H.J. Kim, S.J. Jo, and M.Y. No. 2002. Estimating nutrient solution absorption in cut roses (Rosa hybrida) according to environmental factors. Kor. Res. Soc. Protected Hort. 14:5-9.
11. Kim, W.S. and J.H. Lieth. 2012. Simulation of year-round plant growth and nutrient uptake in Rosa hybrid over flowering cycles. Hort. Environ. Biotechnol. 53:193-203.
12. Kwon, J.K., M.W. Cho, Y.H. Choi, and G.H. Choi. 2007. Effects of different supplementary lighting lamps on growth and quality of cut roses. Kor. J. Hort. Technol. 25:98. (Abstr.)
13. Lee, H.J., Y.B. Lee, and J.H. Bae. 2004. Effects of root zone temperature on the growth and quality of single-stemmed rose in cut rose production factory. Journal of Bio-Environment Control. 13:266-270.
14. Lee, K.S., W.H. Kim, B.S. Yoo, E.K. Lee, Y.N. Oh, J.Y. Kim, and B.H. Kim. 2001. Effects of supplementary light on quality and yield of cut roses in winter. Kor. J. Hort. Technol. 19:104. (Abstr.)
15. Ministry for Food, Agriculture, Forestry and Fisheries (MIFAFF). 2014. The present condition of cultivation of flower in 2013. p. 32-35. MIFAFF. Gwacheon, Korea.
16. Rural Development Administration (RDA). 2001. Standard cultivation textbook for rose. p. 60.
17. The Korea International Trade Association (KITA). 2014. Trade statistics of Korea (http://www.kita.net/statistic).