Effect of coloured shade net on production of Dracaena fragrans
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Dracaena fragrans, shade-net, leaf area, transmittance, quality.Issue
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An experiment was conducted to study the effect of different coloured shade-nets on production and quality of Dracaena fragrans. Plants were grown under different coloured shade-nets, viz. red, green, black, and white with 50% shading intensity along with control (without shade net). Different weather parameters and plant growth parameters were measured at different crop growth stages. Coloured shade net exhibited special optical properties and also influenced the microclimate. Cut greens grown under coloured shade-nets gave better performance in terms of plant height, number of leaves, biomass, leaf area, photosynthetic rate, harvest index etc. compared to control. All the shade-nets reduced temperature, light intensity and improved relative humidity. Red and white shade-nets gave higher photosynthetically active radiation (PAR, μmol/m2 /s) and transmittance than other coloured nets. Plants grown under red and white shade-nets exhibited better plant height, leaf number, leaf chlorophyll content, leaf area, fresh weight, dry weight, photosynthetic rate and transpiration. The harvest index was superior under red shade net. Red and white shade-nets were found superior in improving plant and weather parameters and hence they can be used in place of the commercially used green shade net for improved growth of dracaena.Abstract
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Campanha, M., Santos, R.H., Freitas, G.B.De., Martinez, H.E., Garcia, S.L. and Finger, F.L. 2005. Growth and yield of coffee plants in agroforestry and monoculture systems in Minas Gerais, Brazil. Agroforest. Sys. 63: 75-82. Costa, L.C.D.B., Pinto, J.E.B.P., Castro, E.M.D., Alves, E., Bertolucci, S.K.V. and Rosal, L.F. Effects of coloured shade netting on the vegetative development and leaf structure of Ocimum selloi. Bragantia, 69: 349-59. Crowley, K. 2007. Effects of colored plastic film on several field grown and greenhouse grown cut flower species. M.Sc thesis, Graduate Faculty of Auburn University, Alabama. Fallik, E., Alkalai-Tuvia, S., Parselan, Y., Aharon, Z., Elmann, A., Offir, Y. and Shahak, Y. 2009. Can coloured shade-nets maintain sweet pepper quality during storage and marketing? In: IV Balkan Symposium on Vegetables and Potatoes. , pp. 37-44. Jones, H.G. 1992. Plants and Microclimate: A Quantitative Approach to Environmental Plant Physiology, Cambridge University Press, Cambridge, U.K. Kawabata, A., Lichty, J., Kobayashi, K. and Sahai, W. 2007. Effects of photoselective shade cloths on potted Dracaena deremensis ‘Janet Craig’ and Dracaena marginata Colourama’. J. Hawaiian Pacific Agric. 14: 49-54. Long, S.P., Farage, P.K. and Garcia, R.L. 1996. Measurement of leaf and canopy photosynthetic CO2 exchange in the field. J. Exp. Bot. 47: 1629- Nissim-Levi, A., Farkash, L., Hamburger, D., Ovadia, R., Forrer, I., Kagan, S. and OrenShamir, M. 2008. Light-scattering shade net increases branching and flowering in ornamental pot plants. J. Hort. Sci. Biotech. 83: 9-14. Oren-Shamir, M., Gussakovsky, E., Shpiegel, E., Nissim-Levi, A., Ratner, K., Ovadia,R., Giller, Y., and Shahak, Y. 2001. Coloured shade-nets can improve the yield and quality of green decorative branches of Pittosporum variegatum. J. Hort. Sci. Biotech. 76: 353-61. Shahak, Y., Gussakovsky, E., Gal, E. and Ganelevin, R. 2004. Colournets: Crop protection and light-quality manipulation in one technology. Acta Hort. 659: 143-51. Smith, I.E., Savage, M.J. and Mills, P. 1984. Shading effects on greenhouse tomatoes and cucumbers. Acta Hort. 148: 491-500. Stamps, R.H. and Chandler, A.L. 2008. Differential effects of coloured shade-nets on three cut foliage crops. In: Proceedings XXVII IHC- International Symposium on Cultivation and Utilization of Asian, Sub-Trop., Underutilized Hort. Crops, 770: 169-76. Stamps, R.H. 1994. Evapo-transpiration and nitrogen leaching during leather leaf fern production in shadehouses. Sjrwmd Spec. Publ. SJ94-SP10. St. Johns River Water Management District, Palatka, FL
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