This work is licensed under a
Creative Commons Attribution 4.0 International License
 W. Nazif, S. Perveen, I. Saleem, Status of Micronutrients in soils of District Bhimber (Azad Jammu and Kashmir), Journal of Agriculture and Biological Science. 1 (2006) 34-40.
 M. J. Malakouti, Zinc is a neglected element in the life cycle of plants: A review, Middle East Russian Journal of Plant Science and Biotechnology. 1(1) (2007) 1-12.
 G. E. J. Fisher, Micronutrients and animal nutrition and the link between the application of micronutrients to crops and animal health, Turkish Journal of Agriculture and Forestry. 32(3) (2008) 221-233.
 K. Diedrick, Manganese fertility in soybean production, Pioneer Hi-Bred agronomy sciences. 20(14) (2010).
 R. Millaleo et al., Manganese as essential and toxic element for plants transport, accumulation and resistance mechanisms, Journal of Soil Science and Plant Nutrition. 10(4) (2010) 470-481.DOI: https://doi.org/10.4067/s0718-95162010000200008
 E. D. Imolehim, A. C. Wada, Meeting the Rice Production and Consumption demand of Nigeria with Improved Technologies, National cereal Research Institute, Badeggi, PMB 8, Niger State, Nigeria, 2000, pp.1-11.
 J. O. Saka, Adoption of improved rice varieties among small-holder farmers in south western Nigeria, World Journal of Agricultural Sciences. 1(1) (2005) 42-49.
 F.A.O, Farming systems and poverty: improving farmer's livelihoods in a change world. Rome: Food and agricultural organization. (2001).
 S. Mustapha, Fertility status and productivity constraints of the basement complex-derived Ustults in Bauchi State, Nigeria, Journal of Agriculture Technology. 11 (2003) 11-19.
 G. Lombin, Evaluating the micronutrients fertility of Nigeria's semi-arid savanna soils. I. Copper and manganese, Soil Science. 135 (1983) 377–384.DOI: https://doi.org/10.1097/00010694-198306000-00006
 G. Lombin, Evaluating the micronutrient fertility of Nigerian Semi - Arid Savanna Soils: Zinc Soils, Soil Science. 136 (1983) 42–47.DOI: https://doi.org/10.1097/00010694-198307000-00006
 G. Lombin, Evaluating the micronutrient fertility of Nigeria semi-arid savanna soils. Boron and Molybdenum, Soil Science Plant Nutrition. 13 (1985) 12-25.DOI: https://doi.org/10.1080/17470765.1985.10555213
 S. Mustapha, N. A. Loks, Distribution of available zinc, copper, iron and manganese in the fadama soils from two distinct agro ecological zones in Bauchi State, Nigeria, Journal of Environmental Science. 9(2) (2005) 22-28.
 C. A. Black et al., Method of soil analysis. Part-I physical and mineralogical properties, including statistics of measurement and sampling, American Society Agronomy. (1965) 677.DOI: https://doi.org/10.2134/agronmonogr9.1.frontmatter
 A. L. P. Page, R. H. Miller D. R. Keeny, Methods of Soil Analysis. Agrononomy ASA, Madison, Wisconsin, USA. 9 (1982) 2.
 A. Walkley, C.A. Black, Acid extractable Zn in soil in relation to the occurrence of Zn deficiency symptoms of corn: A method of analysis, Soil Science Society of America Proceedings. 12 (1934) 143-148.
 R.H. Bray, N.T. Kurtz, Determination of total organic and available form of phosphorus in soil, Soil Science. 59 (1945) 39-45.
 C. A. Bouyoucos, A re-calibration of the hydrometer for making mechanical analysis of soils, Agrononomy Journal. 31 (1951) 510-513.
 W. L. Lindsay, W. A. Norvell, Development of DTPA soil test for zinc, iron, manganese and copper, Soil Science Society America Journal. 42 (1978) 421-428.DOI: https://doi.org/10.2136/sssaj1978.03615995004200030009x
 V.O, Chude et al., Fertilizer use and management practices for Crops in Nigeria, 4th edition. Federal Fertilizer Department, Federal Ministry of Agriculture and Rural Development. Abuja, (2012).
 N. Voncir, Content and profile distribution of extractable zinc (Zn) and some physicochemical properties of soil along a toposequence at Bauchi, Northern Guinea Savanna of Nigeria, International Journal of Soil Science. 3 (2008) 62-68.DOI: https://doi.org/10.3923/ijss.2008.62.68
 J. Kolo, S. Mustapha, N. Voncir, Profile distribution of some physio-chemical properties of Haplustults in Gaba District, Central Nigeria, Journal of League Research Nigeria. 10 (2009) 71-77.
 I. E. Esu, Detailed Soil Survey of NIHORT farm at Bunkure, Kano Sate, Nigeria. Institute for Agricultural Research, Ahmadu Bello University, Zaria, Nigeria. (1991) 32.
 D. T. Yaro, The extent and properties of plinthite in a landscape at Zaria, Nigeria, International Journal of Soil Science. 1 (2006) 171- 183.DOI: https://doi.org/10.3923/ijss.2006.171.183
 S. Mustapha, C. C. Nnalee, Fertility and salinity/sodicity status of some fadama soils in Jos, Plateau State, Nigeria, Journal of Sustainable Development in Agriculture and Environment. 3 (2007) 96-103.
 S. Mustapha et al., Contents and distribution of phosphorus forms in some haplic plinthaquults in Bauchi local Government area, Bauchi state, Nigeria, International Journal of Soil Science. 2 (2007) 197-203.DOI: https://doi.org/10.3923/ijss.2007.197.203
 T. Kparmwang, W. B. Malgwi, Some available micronutrients in profiles of Ultisols and Entisols developed from sandstone in northwestern Nigeria, in: B.R. Singh (Ed.). Management of Marginal Lands in Nigeria. Proceedings of the 23rd Annual Conference of Soil Science Society of Nigeria, UDU, Sokoto, Nigeria, 1997, 245-255.
 S. Mustapha, B.R. Singh, Available zinc, copper, iron and Manganese status of the basement – complex rock–derived Ultisol in Bauchi State, Nigeria: A case study. Nigeria Journal of Soil Res. 4 (2003) 35-40.DOI: https://doi.org/10.4314/njser.v4i1.28380
 J.A. Kamasho, B.R. Singh, Available copper and zinc status of some Tanzanian volcanic ash soils: A case study, Pedologie. 32 (1982) 209-224.
 G. B. K. Nziguheba et al., Assessment of nutrient deficiencies in maize in nutrient omission trials and long-term field experiment in the West African Savanna, Plant Soil. 314 (2009) 143-157.DOI: https://doi.org/10.1007/s11104-008-9714-1
 S. Mustapha, H.K. Mamman, N.A. Abdulhamid, Status and distribution of extractable micronutrients in Haplustults in Yamaltu-Deba Local Government Area, Gombe state, Nigeria, Journal of Soil Science and Environmental Management. 1(8) (2010).
 T. Kparmwang, Inherent fertility status of upland and fadama soils in Bauchi State, Nigeria, Noma. 12 (1996) 1-7.
 D.U. Qin et al., Effects of interaction between manganese and cadmium on plant growth and contents of cadmium and manganese in rice, Chinese Journal of Rice Science. 24(2) (2010) 189-195.
 B. Prashad, J. Prashad, R. Prashad, Nutrient management for sustainable rice and wheat production in calcareous soil amended with green manuring, organic manures and zinc. Fertilizer News. 40 (1995) 39-45.
 P.M. Shanmugam, R. Veeraputhran, Effect of organic manure, bio fertilizers, inorganic nitrogen and zinc on growth and yield of rabi rice (Oryza sativa L.), Madras Agricultural Journal. 87(1/3) (2000) 90-93.
 S.R. Mousavi, Zinc in crop production and interaction with phosphorus, Aust. J. Bas. Appl. Sci. 5(9) (2011) 1503-1509.
 B.K. Dube, K. Neena, C. Chatterjee, Yield, physiology and productivity of rice under manganese stress, Indian Journal of Plant Physiology. 7(4) (2002) 392-395.
 A.K. Singh, S. Thakur, S.K. Singh, Response of rice to nitrogen and zinc application in a calcareous situation, Int. Rice Res. Notes. 29 (1995) 16-17.