Effects of blended fertilizers on soil chemical properties of mature tea fields in Kenya

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Kibet Sitienei Hellen W. Kamiri Gilbert M. Nduru David M. Kamau


Kenya tea industry have focused predominantly on the use of compound NPK fertilizers. These fertilizers cannot be easily manipulated for specific soils and tea clones. In this respect, two fertilizer blends contaning NPKS 25:5:5:4+9Ca+2.6Mg and NPKS 23:5:5:4 +10Ca+3Mg with trace elements have been produced commercially in the Country. However, their application rates that would result in optimal nutrients level are lacking. This is the knowledge gap that this study sought to address. Therefore, the fertilizer blends were assessed for their effects on soil chemical properties at different rate in two sites i.e. Timbilil Estate in Kericho and Kagochi farm in Nyeri. The sites were selected purposefully, one in the eastern and the other in the western tea growing areas. Randomized complete block design (RCBD) were used to select 36 trial plots in the two areas which were treated with two fertilizer blends and standard NPK NPK 26:5:5 as control, and four fertilizer application rates (0 -control, 75, 150, and 225 kg N ha-1 yr-1). The trial was replicated three times. Soil samples were collected and analyzed for soil nutrient levels. The data were then subjected to the analysis of variance (ANOVA) using Mstat C computer software package. Soil acidity decreased significantly (P<0.05) down the profile (3.08, 4.02 and 4.08) in Kagochi. Soil available Ca and Mg levels were significantly (P<0.05) higher in the upper depth (Ca were 652 and 412 while Mg were 77 and 62 for Timbilil and Kagochi, respectively) in both sites then decreased down the profile. This study has shown that supplementing the soil applied NPK fertilizers with calcium, magnesium and micronutrients resulted in improved soil quality.


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Sitienei, K., Kamiri, H., Nduru, G., & Kamau, D. (2018). Effects of blended fertilizers on soil chemical properties of mature tea fields in Kenya. Advances in Agricultural Science, 6(4), 85-98. Retrieved from http://aaasjournal.org/submission/index.php/aaas/article/view/102


Adiloglu, A., and Adiloglu, S., 2006. An investigation on nutritional status of tea (Camellia sinensis L.) grown in eastern black sea region of Turkey. Pakistan Journal of Biological Sciences, 9(3), 365-370.
Bahmanyar, M. A., and Mashaee, S. S., 2010. Influences of nitrogen and potassium top dressing on yield and yield components as well as their accumulation in rice (Oryza sativa). African Journal of Biotechnology, 9(18), 2648-2653.
Baligar, V. C., Fageria, N. K., and He, Z. L., 2001. Nutrient use efficiency in plants. Communications in Soil Science and Plant Analysis, 32(7-8), 921-950.
Barlog, P., and Grzebisz, W., 2001. Effect of magnesium foliar application on the yield and quality of sugar beet roots. Rostlinna Vyroba-UZPI (Czech Reopublic).
Ben-Yin, L. I., Huang, S. M., Ming-Bao, W. E. I., Zhang, H. L., Jian-Ming, X. U., and Xin-Ling, R. U. A. N., 2010. Dynamics of soil and grain micronutrients as affected by long-term fertilization in an aquic Inceptisol. Pedosphere, 20(6), 725-735.
Bibiso, M., Taddesse, A. M., Gebrekidan, H., and Melese, A., 2015. Evaluation of universal extractants for determination of some macronutrients from soil. Communications in Soil Science and Plant Analysis, 46(19), 2425-2448.
de la Paix Mupenzi, J., Li, L., Ge, J., Varenyam, A., Habiyaremye, G., Theoneste, N., and Emmanuel, K., 2011. Assessment of soil degradation and chemical compositions in Rwandan tea-growing areas. Geoscience Frontiers, 2(4), 599-607.
Ding, Y., Luo, W., and Xu, G., 2006. Characterisation of magnesium nutrition and interaction of magnesium and potassium in rice. Annals of Applied Biology, 149(2), 111-123.
Flynn, R., Ball, S. T., and Baker, R. D., 2004. Sampling for plant tissue analysis, Guide A-123. New Mexico State University, New Mexico.
Hanafi, M. M., Eltaib, S. M., Ahmad, M. B., and Syed Omar, S. R., 2002. Evaluation of controlled-release compound fertilizers in soil. Communications in soil science and plant analysis, 33(7-8), 1139-1156.
Hansen, J. C., Cade-Menun, B. J., and Strawn, D. G., 2004. Phosphorus speciation in manure-amended alkaline soils. Journal of environmental quality, 33(4), 1521-1527.
Havlin, J. L., Beaton, J. D., Tisdale, S. L., and Nelson, W. L., 2005. Soil fertility and fertilizers: An introduction to nutrient management (Vol. 515, pp. 97-141). Upper Saddle River, NJ: Pearson Prentice Hall.
Hopkins, B. G., Rosen, C. J., Shiffler, A. K., and Taysom, T. W., 2008. Enhanced efficiency fertilizers for improved nutrient management: potato (Solanum tuberosum). Crop Management, 7(1), 0-0.
Ishibashi, Y., Matsuo, H., Baba, Y., Nagafuchi, Y.,Imato, T., and Hirata, T., 2004. Association of manganese effluent with the application of fertilizer and manure on tea field. Water research, 38(12), 2821-2826.
Jackson, M. L., 1995. Soil Chemical Analysis, Advanced Course .Prentice Hall (India), New Delhi.
Jones, C. A., Jacobsen, J., and Lorbeer, S., 2002. Metal concentrations in three Montana soils following 20 years of fertilization and cropping. Communications in soil science and plant analysis, 33(9-10), 1401-1414.
Kalra, Y. P., 1998. Methods for Plant Analysis.
Kamau, D. M., 2008. Productivity and resource use in ageing tea plantations. PhD. Thesis, Wageningen University, Netherlands. P. 140 ISBN 978-90-8504-808-4.
Kamau, D. M., Wanyoko, J. K., and Owuor, P. O., 2005. Mature leaf nutrient levels as a diagnostic tool for making fertilizer recommendations in mature tea: the case of clone BBK 35. Tea, 26(2), 57-69.
Kebeney, S. J., Kamau, D. M., Othieno, C. O., Ng'etich, W. K., and Owuor, P. O., 2010. Changes in soil chemical properties and leaf nutrients content in tea due to nitrogen fertilizer rates and application intervals. Tea, 31(1), 22-37.
Kwach, B. O., Okinda, P., Kamau, D. M., and Wanyoko, K., 2012. Evaluation of foliar analysis as a diagnostic tool of predicting nutrients deficiencies of clonal tea in Kenya.
Lal, K., Swarup, A., and Singh, K. N., 2007. Potassium balance and release kinetics of non-exchangeable K in a typic natrustalf as influenced by long term fertilizer use in rice-wheat cropping system. Agrochimica, 51(2-3), 95-104.
Lasheen, Y. F., Awwad, N. S., El-Khalafawy, A., and Abdel-Rassoul, A. A., 2008. Annual effective dose and concentration levels of heavy metals in different types of tea in Egypt. International Journal of Physical Sciences, 3(5), 112-119.
Nath, T. N., 2013. The status of micronutrients (Mn, Fe, Cu, Zn) in tea plantations in Dibrugarh district of Assam, India. International Research Journal of Environment Sciences, 2(6), 25-30.
Oh, K., Kato, T., Zhong-Pei, L., and Fa-Yun, L., 2006. Environmental Problems from Tea Cultivation in Japan and a Control Measure Using Calcium Cyanamide1. Pedosphere, 16(6), 770-777.
Owuor, P. O., Othieno, C. O., Kamau, D. M., and Wanyoko, J. K., 2011. Effects of long-term fertilizer use on a high-yielding tea clone AHPS15/10: soil pH, mature leaf nitrogen, mature leaf and soil phosphorus and potassium. International Journal of Tea Science (IJTS), 8(1), 15-51.
Ray, S. K., and Mukhopadhyay, D., 2012. A study on physicochemical properties of soils under different tea growing regions of West Bengal (India). International Journal of Agriculture Sciences, 4(8), 325.
Roy, R. N., Finck, A., Blair, G. J., and Tandon, H. L. S., 2006. Plant nutrition for food security. A guide for integrated nutrient management. FAO Fertilizer and Plant Nutrition Bulletin, 16, 368.
Russel, F., 1995. MSTATC Computer Based Statistical Software Package.
Sato, S., Neves, E. G., Solomon, D., Liang, B., and Lehmann, J., 2009. Biogenic calcium phosphate transformation in soils over millennial time scales. Journal of Soils and Sediments, 9(3), 194-205.
Saud, S., and Oud, A. L., 2003. Heavy metal contents in tea and herb leaves. Pakistan Journal of Biological Science, 6, 208-202.
Simonsson, M., Andersson, S., Andrist-Rangel, Y., Hillier, S., Mattsson, L., and Öborn, I., 2007. Potassium release and fixation as a function of fertilizer application rate and soil parent material. Geoderma, 140(1-2), 188-198.
Sitienei, K., Home, P. G., Kamau, D. M., and Wanyoko, J. K., 2013. Nitrogen and potassium dynamics in tea cultivation as influenced by fertilizer type and application rates. American Journal of Plant Sciences, 4(01), 59.
Sparks, D. L., 2000. Bioavailability of soil potassium. Handbook of soil science, 38-52.
Takahashi, S., and Anwar, M. R., 2007. Wheat grain yield, phosphorus uptake and soil phosphorus fraction after 23 years of annual fertilizer application to an andosol. Field Crops Research, 101 (2), 160 –171.
Thomas, G. W., 1996. Soil pH and soil acidity. Methods of Soil Analysis Part 3—Chemical Methods, (methodsofsoilan3), 475-490.
Turner, B. L., Richardson, A. E., and Mullaney, E. J. (Eds.)., 2006. Inositol phosphates: linking agriculture and the environment. CABI.
Venkatesan, S., Murugesan, S., Pandian, V. S., and Ganapathy, M. N. K., 2005. Impact of sources and doses of potassium on biochemical and greenleaf parameters of tea. Food chemistry, 90(4), 535-539.
Virk, S. S., Mullenix, D. K., Sharda, A., Hall, J. B., Wood, C. W., Fasina, O. O., ... and Fulton, J. P., 2013. Case study: Distribution uniformity of a blended fertilizer applied using a variable-rate spinner-disc spreader. Applied engineering in agriculture, 29(5), 627-636.
Yemane, M., Chandravanshi, B. S., and Wondimu, T., 2008. Levels of essential and non-essential metals in leaves of the tea plant (Camellia sinensis L.) and soil of Wushwush farms, Ethiopia. Food Chemistry, 107(3), 1236-1243.
Zentner, R. P., Campbell, C. A., Selles, F., McConkey, B. G., Jefferson, P. G., and Lemke, R., 2003. Cropping frequency, wheat classes and flexible rotations: Effects on production, nitrogen economy, and water use in a Brown Chernozem. Canadian journal of plant science, 83(4), 667-680.
Zhang, F., Niu, J., Zhang, W., Chen, X., Li, C., Yuan, L., and Xie, J., 2010. Potassium nutrition of crops under varied regimes of nitrogen supply. Plant and soil, 335(1-2), 21-34.