[Abdulhamid N.A., Mustapha S. 2009. Influence of agricultural wood ash on some physico-chemical properties of sandy loam soils at Maiduguri, Nigeria. Journal of League of Researchers in Nigeria 10(1): 84–88.]Search in Google Scholar
[Abdulraheem M.I., Ojeniyi S.O. 2015. Combined application of urea and sawdust ash in okra production: Effects on yield and nutrients availability. Nigerian Journal of Soil Science 25: 146–154.]Search in Google Scholar
[Adeboye O.C., Oputa C.O. 1996. Effects of galex on growth and fruit nutrient composition of okra (Abelmoschus esculentus L. Moench). Ife Journal of Agriculture 18(1 & 2): 1–9.]Search in Google Scholar
[Adewole M.B., Dedeke O.A. 2012. Growth performance, yield and nutritional quality of Amaranthus cruentus L. under repeated applications of poultry manures. Ife Journal of Science 14(2): 345–355.]Search in Google Scholar
[Agbede T.M., Adekiya A.O. 2012. Effect of wood ash, poultry manure and NPK fertilizer on soil and leaf nutrient composition, growth and yield of okra (Abelmoschus esculentus). Emirate Journal of Food and Agriculture 24(4): 314–321.]Search in Google Scholar
[Akinrinde E.A., Obigbesan G.O. 2000. Evaluation of the fertility status of selected soils for crop production in five ecological zones of Nigeria. In: Babalola O. (Ed.), Proceedings of the 26th Annual Conference of Soil Science Society of Nigeria. Ibadan, Nigeria, pp. 279–288.]Search in Google Scholar
[AOAC 2003. Official Methods of Analysis of AOAC International. Arlington, Virginia, USA.]Search in Google Scholar
[Awodun M.A., Ojeniyi S.O., Adeboye A., Odedina S.A. 2007. Effect of oilpalm bunch refuse ash on soil and plant nutrient composition and yield of maize. American-Eurasian Journal of Sustainable Agriculture 1: 50–54.]Search in Google Scholar
[Bremner J.M. 1996. Nitrogen-total. In: Sparks D.L. (Ed.), Methods of Soil Analysis, part 3. Chemical Methods. SSSA Book Series 5: 1085–1121. DOI: 10.2136/sssabookser5.3.c37.10.2136/sssabookser5.3.c37]Abierto DOISearch in Google Scholar
[Carter M.R. (Ed.). 1993. Soil Sampling and Methods of Analysis. Lewis Publishers, CRC Press, USA.]Search in Google Scholar
[Chauhan D.S., Gupta M.L. 1973. Effect of nitrogen, phosphorus and potash on growth and development of okra (Abelmoschus esculentus) in sand culture. India Journal of Horticulture 30: 401–405.]Search in Google Scholar
[ECHO 2003. Plant information sheet, N.F.T. Meyers, USA. http://echonet.com/]Search in Google Scholar
[Etiégni L., Campbell A.G. 1991. Physical and chemical characteristics of wood ash. Bioresource Technology 37: 173–178. DOI: 10.1016/0960-8524(91)90207-z.10.1016/0960-8524(91)90207-Z]Abierto DOISearch in Google Scholar
[Ewulo B.S., Babadele O.O., Ojeniyi S.O. 2009. Sawdust ash and urea effect on soil and plant nutrient contents and yield of tomato. American-Eurasian Journal of Sustainable Agriculture 3(1): 88–92.]Search in Google Scholar
[Frank K., Beegle D., Denning J. 1998. Phosphorus. In: Brown J.R. (Ed.), Recommended chemical soil test procedures for the North Central Region, North Central Regional Research Publication No. 221 (revised). Columbia (MO): Missouri Agriculture Experiment Station p. 21–26.]Search in Google Scholar
[Gee G.W., Or D. 2002. Particle-size analysis. In: Dane J.H., Topp G.C. (Eds.), Methods of Soil Analysis, part 4. Physical Methods. SSSA Book Series 5: 255–293. DOI: 10.2136/sssabookser5.4.c12.10.2136/sssabookser5.4.c12]Search in Google Scholar
[Hendershot W.H., Lalande H. 1993. Ion exchange and exchangeable cations. In: Carter M.R. (Ed.), Soil Sampling and Methods of Analysis. Lewis Publishers, CRC Press, USA.]Search in Google Scholar
[Horwitz W., Latimer G.W. (Eds.). 2005. Official Methods of Analysis of AOAC International. Arlington, Virginia, USA.]Search in Google Scholar
[Kabata-Pendias A., Mukherjee A.B. 2007. Trace Elements from Soil to Human. Springer–Verlag, 550 p. DOI: 10.1007/978-3-540-32714-1.10.1007/978-3-540-32714-1]Abierto DOISearch in Google Scholar
[Majanbu I.S., Ogunlela V.B., Ahmed M.K. 1986. Response of two okra (Abelmoschus esculentus L. Moench) varieties to fertilizers: growth and nutrient concentrations as influenced by nitrogen and phosphorus application. Fertilizer Research 8: 297–306. DOI: 10.1007/bf01048632.10.1007/BF01048632]Search in Google Scholar
[Milford G.F.J., Armstrong M.J., Jarvis P.J., Houghton B.J., Bellett-Travers D.M., Jones J., Leigh R.A. 2000. Effects of potassium fertilizer on the yield, quality and potassium offtake of sugar beet crops grown on soils of different potassium status. Journal of Agricultural Science 135: 1–10. DOI: 10.1017/s0021859699007881.10.1017/s0021859699007881]Abierto DOISearch in Google Scholar
[Nelson D.W., Sommers L.E. 1996. Total carbon, organic carbon, and organic matter. In: Sparks D.L. (Ed.), Methods of Soil Analysis, part 3. Chemical Methods. SSSA Book Series 5: 961–1010. DOI: 10.2136/sssabookser5.3.c34.10.2136/sssabookser5.3.c34]Abierto DOISearch in Google Scholar
[Odedina S.A., Odedina J.N., Ayeni S.O., Arowojolu S.A., Adeyeye S.D., Ojeniyi S.O. 2003. Effects of types of Ash on soil fertility, nutrient availability and yield of tomato and pepper. Nigerian Journal of Soil Science 13: 61–67.]Search in Google Scholar
[Omolaiye J.A., Jayeoba O.J., Akoun J., Ogunbanjo O.R., Adams B.A., Ashidi J.S. 2015. Development of leaf area prediction model of okra (Abelmoschus spp). Production Agriculture and Technology Journal 11(1): 130–136.]Search in Google Scholar
[Owolabi O., Adeleye A., Oladejo B.T., Ojeniyi S.O. 2003. Effect of wood ash on soil fertility and crop yield in Southwest Nigeria. Nigerian Journal of Soil Science 13: 55–60.]Search in Google Scholar
[Park B.B., Yanai R.D., Sahm J.M., Ballard B.D., Abrahamson L.P. 2004. Wood ash effects on soil solution and nutrient budgets in a willow bioenergy plantation. Water, Air, and Soil Pollution 159: 209–224. DOI: 10.1023/b:wate.0000049177.60761.37.10.1023/b:wate.0000049177.60761.37]Abierto DOISearch in Google Scholar
[Prabhakar B.S. 1996. Phosphate and potash use in vegetable crops. Better Crops International 10(2): 16–18.]Search in Google Scholar
[Solangi M., Suthar V., Wagan B., Siyal A.G., Sarki A., Soothar R.K. 2015. Evaluate the effect of nitrogen and phosphorus fertilizer doses on growth and yield of spinach (Spinacia oleracea L.). Science International (Lahore) 28(1): 379–383.]Search in Google Scholar
[Siemonsma J.S. 1982. The cultivation of okra (Abelmoschus spp.), a tropical fruit vegetable (with special reference to Ivory Coast). Ph.D. thesis, Wageningen University, the Netherlands, 297 p. [in French with English abstract]]Search in Google Scholar
[Steenari B-M., Karlsson L.G., Lindqvist O. 1999. Evaluation of the leaching characteristics of wood ash and the influence of ash agglomeration. Biomass and Bioenergy 16: 119–136. DOI: 10.1016/s0961-9534(98)00070-1.10.1016/S0961-9534(98)00070-1]Abierto DOISearch in Google Scholar
[Tel D.A., Hagarty M. (Eds.). 1984. Soil and Plant Analysis. International Institute of Tropical Agriculture, Nigeria; University of Guelph, Canada, 277 p.]Search in Google Scholar
[Udo E.J., Ibia T.O., Ogunwale J.A., Ano A.O., Esu I.E. 2009. Manual of Soil, Plant and Water Analyses. Sibon Books, Nigeria, 183 p.]Search in Google Scholar
[Verma V.K., Pundrik K.K.C., Chauhan K.S. 1970. Effect of different levels of N, P and K on vegetative growth and yield of okra. Punjab Horticultural Journal 10: 130–136.]Search in Google Scholar
