Critical potassium deficiency levels for a grass/ legume pasture grown on soils of the subhumid zone of Nigeria

References

• Andrew , C.S. and Robins , M.F. 1969 . The Effect of potassium on the growth and chemical composition of some tropical and temperate pasture legumes . Aust. J. Agric. Res. , 20 : 999 – 1007 .
   Google Scholar
• Association of Official Analytical Chemists (A.O.A.C.) . 1970 . Official Methods of Analysis, , 11th edition , Washington, DC : Association of Official Analytical Chemists .
   Google Scholar
• Ayodele , O.J. 1980 . Correlation and calibration studies on phosphorus in savanna soils of south western Nigeria , Ibadan , , Nigeria : University of Ibadan . Ph.D. Thesis
   Google Scholar
• Blaser , R.E. and Brady , N.C. 1950 . Nutrient competition in plant associations . Agron. J. , 42 : 128 – 135 .
   Web of Science ®Google Scholar
• Bowden , B.N. 1963 . Studies on Andropogon gayanus Kunth: I. The use of Andropogon gayanus in agriculture . Empire J. Exper. Agric. , 31 : 267 – 273 .
   Web of Science ®Google Scholar
• Cate , R.B. Jr. and Nelson , L.A. 1965 . A rapid method for correlation of soil test analysis with plant response data , International Soil Testing Series Technical Bulletin No. 1.
   Google Scholar
• Crowder , L.V. and Chheda , H.R. 1982 . “ Grassland improvementrestablishment and renovation of the sward ” . In Tropical Grass and Husbandry , Edited by: Crowder , L.V. and Chheda , H.R. 118 – 147 . New York , NY : Longman .
   Google Scholar
• Gray , B. , Drake , M. and Colby , W.C. 1953 . Potassium competition in grass‐legume association as a function of root cation exchange capacity . Soil Sci. Soc. Amer. Proc. , 17 : 235 – 239 .
   Web of Science ®Google Scholar
• Heathcote , R.G. and Stockinger , K.R. 1970 . Soil fertility under continuous cultivation in northern Nigeria. II. Responses to fertilizers in the absence of manures . Expl. Agric. , 6 : 345 – 350 .
   Web of Science ®Google Scholar
• Heathcote , R.G. 1972 . “ Potassium fertilization in the savanna zone of Nigeria. ” . In Potash Review, sub. 16, 57th suite , 1 – 7 . Bern , , Switzerland : International Potash Institute .
   Google Scholar
• Heathcote , R.G. 1973 . The effect of potassium and trace elements on yield in northern Nigeria . Afri. Soils , 17 : 85 – 89 .
   Google Scholar
• Jackson , M.L. 1958 . Soil Chemical Analysis , Englewood Cliffs , NJ : Prentice‐Hall Inc. .
   Google Scholar
• Kumar , B. , Roy , H.K. and Kumar , A. 1991 . Critical limits of potassium in a soil series . J. Indian Soc. Soil Sci. , 39 : 504 – 509 .
   Google Scholar
• Lombin , G. , Singh , L. and Yayock , J.Y. 1985 . A decade of fertilizer research on groundnuts (Arachis hypogaea L.) in the Nigerian savanna . Fert. Res. , 6 : 157 – 170 .
   Web of Science ®Google Scholar
• Mohamed‐Saleem , M.A. The ecology, vegetation and land‐use of subhumid Nigeria . Livestock Systems Research in Nigeria's Subhumid Zone. Proceedings of the Second ILCA/NAPRI Symposium held in Kaduna . 1984 , Nigeria. Edited by: von Kaufmann , R. , Chater , S. and Blench , R. pp. 59 – 84 . Addis Ababa , , Ethiopia : ILCA . 29 October‐ 2 November
   Google Scholar
• Mohamed‐Saleem , M.A. and von Kaufmann , R. 1986 . Effect of phosphorus application on the productivity of three Stylosanthes cultivers . Trop. Agric. (Trinidad) , 63 : 212 – 216 .
   Web of Science ®Google Scholar
• Mohamed‐Saleem , M.A. , Otsyina , R.M. and Butterworth , M.N. 1986 . Performance of Stylosanthes hamata cv. Verano as influenced by nutrient changes . Trop. Agri. (Trinidad) , 63 : 71 – 220 .
   Web of Science ®Google Scholar
• Mohamed‐Saleem , M.A. and Suleiman , H. 1986 . Fodder Banks ‐ dry season feed supplementation for traditionally managed cattle in the subhumid zone . World Animal Rev. , 5 : 11 – 17 .
   Google Scholar
• Mohamed‐Saleem , M.A. and Otsyina , R.M. 1987 . Effects of naturally occurring salt “Kanwa”; as a fertilizer on the productivity of Stylosanthes in the subhumid zone of Nigeria . Fert. Res. , 13 : 3 – 11 .
   Google Scholar
• Otsyina , R.M. , von Kaufmann , R.R. , Mohamed‐Saleem , M.A. and Suleiman , H. 1987 . Manual on Fodder Bank Establishment and Management , Addis Ababa , , Ethiopia : Subhumid Zone Programme. ILCA .
   Google Scholar
• Singh , D. , Brar , M.S. and Brar , A.S. 1991 . Response of K application and its critical levels for American cotton (Gossypium hirsutum L.) . J. Indian Soc. Soil Sci. , 39 : 494 – 499 .
   Google Scholar
• Standley , J. 1981 . Critical phosphorus and potassium concentrations for Stylosanthes guianensis cv Schofield in north Queensland . Trop. Grassl. , 15 : 58 – 59 .
   Google Scholar
• Tarawali , S.A. 1991 . Preliminary agronomic evaluation of forage legumes for subhumid West Africa . Trop. Agric. (Trinidad) , 68 : 88 – 94 .
   Web of Science ®Google Scholar
• Tiwari , K.N. , Vandana , N. and Pathak , A.N. 1985 . Studies on the potassium requirements of different crops . Fert. Res. , 8 : 91 – 96 .
   Web of Science ®Google Scholar
• Walker , B. , Kerridge , P.C. and Webb , A.A. 1979 . Soil fertility studies for pastures in the Mackay wet tropical coast of Queensland . Trop. Grassl. , 13 : 110 – 122 .
   Google Scholar
• Department of Agronomy, University of Ibadan, Ibadan, Nigeria
   Google Scholar
• International Livestock Centre for Africa (ILCA) Subhumid Research Site, PMB 2248, Kaduna, Nigeria
   Google Scholar
• Corresponding author.
   Google Scholar