Biology and Life Sciences

Biology and Life Sciences

Effect of Graded Shade Levels on the Growth and Quality of Polyscias guilfoylei ‘variegata’ in the Batticaloa District of Sri Lanka

Pages: 14  ,  Volume: 6  ,  Issue: 1 , June   2018
Received: 23 Jun 2018  ,  Published: 23 June 2018
Views: 221  ,  Download: 88


# Author Name
1 Miss.Narmhikaa Krishnamoorthy
2 Mr .Shanmugalingam Srikrishnah
3 Dr. Somasundaram Sutharsan
4 Miss.Mayoory Jeyarajasingam


Backround and objective :Polyscias guilfoylei ‘variegata’is an beautifully variegated ornamental foliage shrub having   lush green leaves   with large irregular patches of ochre yellow from the midvein to the edges. The morphology of the leaves adds value for its quality in the export market. Light intensity greatly influences the amount of variegation in these plants. A shade house experimentation was carried out to estimate the effects of graded shade levels on the growth and quality of Polyscias guilfoylei ‘variegata’, in the Batticaloa district of Sri Lanka from July 2017 to November 2017.Materials and methods:The experiment was arranged in a completely randomized design with three replications. The experimental location was crop farm, Eastern University, Sri Lanka. Graded shade levels were defined as treatments viz. Control (T1), 50% (T2), 60% (T3), 70% (T4), and 80% (T5), of shade levels. Shade houses were constructed using commercial nylon nets of different shade level. Rooted, uniform cuttings of were used as planting materials. Agronomic practices were followed uniformly for all treatments. Plant height, leaf area, number of leaves , plant biomass and SPAD value  were measured at monthly interval and quality of cuttings was evaluated at the end of experiment. Analysis of Variance was performed to determine significant difference among treatments (p< 0.05). Plants provided with 50% shading showed significantly (p<0.05) better performance in measured growth parameters viz. plant height, plant biomass and biomass partitioning, while the lowest performance was observed in plants from 80% (T5) shading (lower irradiation) and open field (higher irradiation)  condition (T1) . Results: Results revealed that, plants provided with 70% shade level showed significantly (p<0.05) better performance in measured growth parameters.  In quality assessment also, plants grown at 70% shade level (T4) received significantly highest score.  Conclusion: Therefore, it could be concluded that, 70% shade level is optimum for the export oriented cultivation of Polyscias guilfoylei ‘variegata’ in the Batticaloa district of Sri Lanka. This is beneficial to the farmers who are engaged in the floriculture cultivation in Batticaloa district of Sri Lanka. They can improve the quality of the plants by providing 70% shade level. It leads to improve their economic savings and market demand.


  • Plant height;Shade level; Biomass;Leaf thickness;SPAD value;Leaf area
  • References


    1.       Senevirathne G.A.S.S., Kumari D.L.C. and Disanayake L. (2007). Productivity improvement of foliage plant Dracaena sanderiana (Ribbon Dracaena) variety "White". Proceedings of the Sri Lanka Association of Advancement of Science. 63(1), 186.

    2.       Gaurav, A. K., Raju, D., T Janakiram, B. S., Jain, R., and Krishnan, S. G. (2015). Effect of shade levels on production and quality of Cordyline (Cordyline terminalis). Indian Journal of Agricultural Sciences, 85(7), 931-5.

    3.       Weerakkody, W.A.P. (2004). Horticulture in Sri Lanka, Chronica Horticulture. 44, 23-27.

    4.       Gunadasa, H. K. S. G., & Dissanayake, P. K. (2012). Optimization of quality in exported Polyscias balfouriana" Marginata" by using different shade levels. Journal of Agricultural Sciences, 7(2)

    5.       Srikrishnah, S., Peiris, S. E., & Sutharsan, S. (2012). Effect of shade levels on leaf area and biomass production of three varieties of Dracaena sanderiana L. in the dry zone of Sri Lanka.

    6.       Krishnakanth, M., Srikrishnah, S., & Sutharsan, S. (2017). Effects of graded shade levels on the growth and quality of Cordyline fruiticosa variety ‘Purple Compacta ’in the Batticaloa district. AGRIEAST: Journal of Agricultural Sciences, 11(1).

    7.       Vilela, A. E., and Ravetta, D. A. (2000). The effect of radiation on seedling growth and physiology in four species of Prosopis L.(Mimosaceae). Journal of Arid Environments, 44(4), 415-423.

    8.       Michal Oren-Shamir., Eugene Gussakovsky., Eliezer Eugene., Ada Nissim-Levi., Kira Ratner., Rinat Ovadia., Yuri Giller., and  Yosepha Shahak. (2015). Coloured shade nets can improve the yield and quality of green decorative branches of Pittosporum variegatum, The Journal of Horticultural Science and Biotechnology, 76(3), 353-361. DOI: 10.1080/14620316.2001.11511377

    9.       Conover, C.A. and R.T. Poole. (1986). Nitrogen source effects on growth and tissue content of selected foliage plants. HortScience 21 (4): 1008- 1009.

    10.    Cockshull, K.E., Graves, C.J., and Carol R. J. Cave. (2015). The influence of shading on yield of glasshouse tomatoes, Journal of Horticultural Science, 67(1), 11-24, DOI: 10.1080/00221589.1992.11516215

    11.    Mattana R.S., Ming L.C., Marchese J.A. and Marques M.O.M. (2006). Biomass production in plants of Pothomorphe umbellata (L.) Miq. Submitted to different shade levels. Brazilian Journal of Medical and Biological Research., 8, 83-85.

    12.    Kittas, C., Rigakis, N., Katsoulas, N., and Bartzanas, T. (2008). Influence of shading screens on microclimate, growth and productivity of tomato. In: International Symposium on Strategies towards Sustainability of Protected Cultivation in Mild Winter Climate 807, 97-102

    13.    Prasad S. and Kumar U. (1998). Principles of Horticulture. Agro Botanica

    14.    Morais, H., Marur, C.J., Caramori, P.H., Ribeiro, A.M.A. de., and Gomes, J.C. (2003). Características fisiológicas e de crescimento de cafeeiro sombreado com guandu e cultivado a pleno sol. Pesquisa Agropecuária Brasileira, v.38, n.10, p.1131-1137. DOI: 10.1590/S0100-204X2003001000001. 10 Set. 2010.

    15.    Villegas E., Pérez M. and Lao M.T. (2005). Influence of lighting levels by shading cloths on Cyclamen persicum quality. Acta Horticulturae, 711, 145-150.

    16.    Hlatshwayo M.S. and Wahome P.K. (2010). Effects of shading on growth, flowering and cut flower quality in carnation (Dianthus caryohyllus). Journal of Agriculture and Social Sciences, 6(2), 34-38.

    17.    Dalirie M.S., Sharifi R.S. and Farzaneh S. (2010). Evaluation of yield, dry matter accumulation and leaf area index in wheat genotypes as affected by terminal drought stress. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 38(1), 182-186.

    18.    Devkota, A. and Jha, P.K. (2010). Effects of different light levels on the growth traits and yield of Centella asiatica. Middle East Journal of Scientific Research. 5(4): 226- 310

    19.    Lykas, C.H. and Katsoulas, N. (2012). Use of shading nets to improve quality characteristics of compact gardenia (Gardenia jasminoides Ellis) potted plant. Acta Hort. 952: 281-285

    20.    Forster, M. A., and Bonser, S. P. (2009). Heteroblastic development and the optimal partitioning of traits among contrasting environments in Acacia implexa. Annals of botany, 103(1), 95-105.

    21.    Noordegraaf C. (1992). Production and marketing of high quality plants. International Workshop on Floriculture & Nursery Industries and Environment, 353, 134-148.

    22.    Ballantine J.E.M. and Forde B.J. (1970). The effect of light intensity and temperature on plant growth and chloroplast ultrastructure in soybean. American Journal of Botany, 57(10), 1150-1159.

    23.    Prasad, S. and Kumar, U. (2003). Stress Physiology of Horticultural Crops. Principles of Horticulture, Agrobios, 191-193.