A field experiment was conducted to study the effect of different levels of potassium and zinc on growth, yield and economics of sweet potato. The experiment was laid out on clay and loam soil by adopting randomized block design with factorial technique (FRBD). The sixteen treatments consisted of combination of four levels of po-tassium (0, 80, 100 and 120 kg/ha through muriate of potash and four levels of foliar zinc (control i.e. water spray, 10, 20 and 30ppm) through zinc sulphate. The individual application of potassium 120 kg K2O/ha significantly in-creased the number of tubers per plant (4.60), average weight of tuber (275.31 g), length of tuber (16.77 cm), diam-eter of tuber (5.69 cm), tuber yield per plot (9.71 kg), tuber yield per hectare (49.04 t) respectively as compared to control. With the foliar application of zinc (30 ppm) significant increase in number of tubers per plant (4.18), average weight of tuber (234.73 g), length of tuber (18.12 cm), diameter of tuber (5.16 cm), tuber yield per plot (8.33 kg) and tuber yield per hectare (42.05 t) was recordedas compared to control. The treatment combination (120 kg K2O+30ppm Zn) recorded the maximum yield parameters i.e. chlorophyll content (37.00 mg/100 g), average weight of tuber (302.17 g), length of tuber (19.82 cm), diameter of tuber (5.97 cm), maximum tuber yield per plot (11.02 kg), tuber yield per hectare (55.67 t) and benefit-cost ratio (B: C ratio) of 4.22:1.While, the treatment (120 kg K2O+30ppm Zn) had the maximum number of tuber (4.86), minimum number of tuber was recorded in control. From the experi-ment, it appeared that application of potassium and zinc can be used to improve yield and higher net monetary re-turns of sweet potato.
Growth, Potassium, Sweet potato, Zinc, Yield
Anonymous, (2014).Indian Horticulture Database, National Horticulture Board, Gurgaon pp.194-197
Cakmak I. (2000): Possible role of zinc in protecting plant cells from damage by reactive oxygen species. New Phytologist, 146: 185–205
Cakmak, I. (2005). The role of potassium in alleviating detrimental effects of abiotic stresses in plants. J. Plant Nutr. Soil Sci., 168:521-530
Cao, W. and T.W. Tibbitts, (1991).Potassium concentration effect on growth, gas exchange and mineral accumulation in potatoes. Journal of plant nutrition, 14 (6), 525- 537.
DEFRA (2010). Fertiliser manual (RB209) (8th ed.). Norwich: TSO, London.
Degras, L. (2003). Sweet potato. The Tropical Agriculturalist. Malaysia: Macmillan Publishers Ltd.
Edison, S., Hegde, V., Makesh Kumar, T., Srinivas, T., Suja, G. and Padmaja, G. (2009).Sweepotato in the Indian sub continent. In:The Sweet Potato. Lobenstein, G. and Thottappilly, G. (Eds.). Springer Science Publishers, pp.391-414.
El-Hadidi, E.M. and Mansour, M.M. (2008). Effect of potassium and zinc fertilization on growth, nutrients contents and yield. J. of Agric. Sci., 33(6):4589-4608
George, J. and Mittra, B.N. (1996).Effect of application of ash and paper factory sludge as source of micronutrients on the performance of sweet potato. In: Tropical Tuber Crops in Food Security and Nutrition. Balagopalan, C., Nayar, T.V.R., Sundaresan, S., Premkumar, T. and Lakshmi, K.R. (Eds.).Oxford & IBH Publishing Co. Pvt. Ltd., New Delhi. pp. 338-343.
Gomez, K. A. and Gomez, A. A. (1984). Statistical Procedures for Agricultural Research, Second edition, A Wiley Interscience Publication, New York, USA.
Katyal, J.C. (2004).Role of micronutrients in ensuring optimum use of macronutrients.IFA International symposium on micronutrients, New Delhi, India pp 3-17.
Kazi, S.S., Syed Ismail and Joshi K.G. (2012). Effect of multi -micronutrient on yield and quality attributes of sweet orange. African J. of Agric. Res.,7(29):4118-23.
Kiran, J. (2006). Effect of fertilizer, bio-fertilizer and micro-nutrients on seed yield and quality of brinjal (Solanum melongena L.). Department of seed science and technology college of agriculture, Dharwad, (India) pp. 1-2.
Lu, J. W., Chen, F., Xu, Y., Wan, Y.F. and Liu, D.B. (2001). Sweet potato response to potassium Better Crops International; 15(1):10-12
Malvi, U.R. (2011). Interaction of micronutrients with major nutrients with special reference to potassium. Karnataka J. Agric. Sci., 24(1) :106-109
Marschner, H. (1995). Functions of mineral nutrients: macronutirents, In: H. Marschner (ed.). Mineral nutrition of higher plants 2nd Edition. Academic Press, N.Y. London p. 299-312.
Marschner, P., (2012). Mineral Nutrition of Higher Plants, 3rd ed.; Academic Press: London, UK,; pp. 178–189
Mengel, K. and Kirkby, E.A. (2001).Principles of Plant Nutrition. 5th ed., Kluwer Academic Publishers, Dordrecht.
Metson, A. J. (1956). Methods of chemical analysis for soil survey samples. Department of Science Md. Res. Soil Bur. pp. 12.
Moinuddin, Singh K., Bansal S.K., (2005). Growth, yield, and economics of potato in relation to progressive application of potassium fertilizer. - Journal of Plant Nutrition, 28: 183-200
Olsen, S. R., Cole, C. S., Wantable, F. S. and Dean, C. A., (1954). Estimation of available phosphorus in soils by extraction with sodium bicarbonate U.S.D.A., Washington, D.C. Circular.18: 939
Pedler, J.F., Parker, D.R. and Crowley, D.E. (2000). Zinc Deficiency-induced phytosiderophore release by the Triticaceae is not consistently expressed in solution culture. Planta, 211: 120-126
Potarzycki, J. and W. Grzebisz.(2009). Effect of zinc foliar application on grain yield of maize and its yielding components.Plant Soil Environ. 55(12): 519-527
Romheld, V. and E.A. Kirkby, (2010). Research on potassium in agriculture: Needs and prospects. Plant Soil, 335, 155–180
Sharma, P. N., Tripathi A. and Bisht, S. S. (1995). Zinc requirement for stomatal opening in cauliflower. Plant Physio.,107: 751–756
Singh, S. and Singh, P. (2004). Economic viability of foliar application of nitrogen and zinc in cauliflower (Brassica oleracea var. botrytis L.). Scientific Horticulture, 9:237-239.
Sokoto, M. B., Magaji, M. D. and A. Singh, A. 2007.Growth and Yield of Irrigated Sweet Potato (Ipomoea batatas Lam.) As Influenced by Intra-Row Spacing and Potassium. Journal of Plant Sciences, 2: 54-60
Subbiah, B.V. and Asija, G.L. (1956).A rapid p1rocedure for the estimation of available nitrogen in soils. Current Sci., 126: 244-253
Umar S. Amd Moinuddin (2001). Effect of sources and rates of potassium application on potato yield and economic returns. Better Crops, 15: 13-15
USDA (2010).Keys to Soil Taxonomy, 10th Ed., Soil Survey Staff, Natural Resources Conservation Service, USDA, USA.
Uwah, D.F., Undie, U.L., John , N.M., and Ukoha, G.O. (2013). Growth and yield response of improved sweet potato varieties to different rates of potassium fertilizer in Calabar, Nigeria J. of Agric. Sci., 5(7) 61-69
Vitosh, M.L., Warncke, D.D. and Lucas, R.E. (1994). Zinc determine of crop and soil. Michigan State University Extension.
Walkley, A. and Black, I. A. (1934).An examination of Degtjareff method for determining soil organic matter and a proposed modification of the chromic acid titration method. Soil Sci., 37:29-37
Zörb C., Senbayram M. and Peiter E. (2014). Potassium in agriculture - Status and perspectives. Journal of Plant Physiology, 171: 656?669
This work is licensed under Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) © Author (s)