[1] Anonymous, (2009). Rose geranium production. Directorate Agricultural Information Services, Republic Of South Africa, DPP @ nda.agric.za.
[2] Araya H. T., P. Soundy., J. M. Steyn., C. Teubes., R. A. Learmonth., and N. Mojela (2006). Response of herbage yield, essential oil yield and composition of South African rose-scented Geranium (Pelargonium sp.) to conventional and organic nitrogen. J. of Essential oil Res. 18: 111-115.
[3] Bhati, R. S. and S. D. Chitkara (1987). Effect of Pinching and Planting Distance on the Growth and Yield of Marigold (Taget erecta). Research and Development Reporter, 4(2): 159-164.
[4] Brady, N. C. (1984). The Nature and Properties of Soils, Macmillan Publication, New Delhi, pp. 215-216.
[5] Cabrera, R. I. (2003). Fundamentals of container media management. Part I, Physical Properties, the State University of New Jersey Agricultural Experiment Station. USA.
[6] Hammo, Y. H. and S. F. Hadar (2010). Using of some environmental materials to obtain suitable media for potted plants and evaluateion of four kinds of foliar fertilizers through its effect on (1-vegetative and roots growth) of Nephrolepis exaltata l. Mesopotamia J. of Agric.38 :( 2).
[7] Hidalgo. P. R., R. L. Harkess., and F. Matta (2001). Fertilizer Rate Effect on Chrysanthemum Production in Vermicompost Substrates, SNA Research Conference. 46: 39-42.
[8] Jhon, A. Q. and T. M. Paul (1995). Influence of spacing and pinching treatments on growth and flower production in Chrysanthemum Chrysanthemum morifolium Ramat cv. Flirt. Progressive Horticulture, 27: (1-2): 57-61.
[9] Joshi, A. S., A. V. Barad., R. L. Misra., and S. Misra (2002). Effect of N, P and pinching on the nutrient composition by African marigold, Floriculture Research Trend in India. Proceedings of the National Symposium on Indian Floriculture in the New Millenium, Lalbagh, Bangalore, 25-27th February: 334-335.
[10] Kiruthikadevi, V. (2002). Nutritional studies on root yield and quality of ashwagandha (Withaniaso mnifera Dunal). M.Sc. Thesis, Horticultural College and Research Institute, Periyakulam, Tamil Nadu Agricultural University.
[11] Milkha, S. A., and S. S. Malhi (2005). Interaction of nitrogen and other nutrients and water: Effect on crop yield and quality, nutrient use efficiency, carbon sequestration and environmental pollution. In Advances in Agronomy, 86: 341-368.
[12] Muhammad M., and F. Naz (2006). Growth and flowering response of Snapdragons after release from apical dominance. Journal of Applied Horticulture, 8(1): 25-28.
[13] Panchabhai, D. M., B. R. Bachkar., S. M. Ghawade., and S. G. Wankhade (2005). Effect of nitrogen and phosphorus on growth and seed yield of Ashwagandha (Withaniasom nifera L.). Orissa Journal of Horticulture, 33(1):11-15.
[14] Powlson, D. S., A. B. Riche., K. Coleman., M. J. Glendining., and A. P. Whitmore (2008). Carbon sequestration in European soils through straw incorporations and alternatives. Waste Management 28:741-746.
[15] Ramanujam, T. (1982). Influence of nitrogen on leaf area index, crop growth rate, net assimilation rate and yield of cassava. Journal of Root Crops, 8(12): 27-33.
[16] Rao, D. V. R., S. A. Balasubramanyam., K. R. Balakrishna., and V. Suryanarayana (1992). Effect of different spacing and nitrogen levels on growth and flower yield of Chrysanthemum (Chrysanthemum indicum l.) cv. kasturi. South Indian Horticulture, 40(6): 323 – 328.
[17] Russel, E. W. (1973). Soil Condition and Plant Growth. London Group Ltd., London, 10th Edition, pp. 30-43.
[18] Salem A. G., and A. M., Awad (2005). Response of Coriander plants to organic and mineral fertilizers fertigated in sandy soils. Egyptian Journal of Agricultural Research. 83(2): 829-858.
[19] SAS. (2001). Statistical Analysis System. SAS Institute Inc., Cary, Nc. USA.
[20] Sigedar, P. D., A. K. W. Adekar., and B. M. Rodge (1991). Effect of different levels of NPK on growth and yield of Calendula officinalis Linn. South Indian Horticulture, 39: 308-311.
[21] Sonneveld, C., and W. Voogt (2009). Plant Nutrition of Greenhouse Crops, Printed on acid-free paper, Springer Science, Business Media B.V.
[22] Sunitha H. M. (2006). Effect of plant population, nutrition, pinching and growth regulators on plant growth, seed yield and quality of African marigold Targetes erecta L. MS Thesis College of Agriculture, Dharwad University of Agricultural Sciences, India.
[23] Ting, I. P. (1981). Plant physiology Second ed. Wesley New York.
[24] Vander Walt, J. J. A. and P. J. Vorster (1988). Pelargonium of Southern Africa, Vol. 3. National Botanic Gardens, Kirstenbosch. Juta, Cape Town.
[25] Verma, R. B., P. K. Singh, and S. B. Singh (1996). Effect of nitrogen and potassium levels on growth, yield and nutrient uptake of Colocasia. Journal of Root Crops, 22(2): 139-143.
[26] Verma, R. K., L. U Rahman., R. S. Verma., Kalra A., A. K Kukreja., and A. S Bisht (2011). Assessing N-use efficiency, planting time and economics of fertilizer N in Rose-scented Geranium (Pelargonium graveolens L’ Herit) in Western Himalayan Region of India. African Journal of Agricultural Research. 6(3): 553-559.
[27] Vikram, M. (1988). The effect of Pheretima Alexandri (Beddard) on the growth of Vinca rosea and Oryza sativa L. In: Earthworms in Waste and Environmental Management eds. C. A. Edwards and E. F. Neuhauser, pp. 211-219.
[28] Watt, J. M., and M. G., Brandwijk (1962). The Medicinal and Poisonous Plants of Southern and Eastern Africa. 2nd Ed. E & S Livingstone Ltd., Edinburgh & London.