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Agro-Science
Journal of Tropical Agriculture, Food, Environment and Extension
 

ISSN 1119-7455
   
 
         
 
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Article No 2 of Volume 9.2 (2010)
 
    
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PROFILE DISTRIBUTION OF CLAY, Ca, Mg AND K IN SOME SOILS OF THE SAVANNA REGION OF NIGERIA

PROFILE DISTRIBUTION OF CLAY, Ca, Mg AND K IN SOME SOILS OF THE SAVANNA REGION OF NIGERIA

 

Obi1, J. C*, Akinbola2, G. E., Ogunkunle2, A. O. and Umeojiakor2, A. O.

1Department of Soil Science, University of Uyo, Uyo, Nigeria.

2Department of Agronomy, University of Ibadan, Ibadan, Nigeria.

ABSTRACT

Clay content and ratios of exchangeable cations are highly dependent on characteristics of soil parent material and deferential effect of weathering/leaching. Calcium (Ca) and magnesium (Mg) contents of soils are significantly correlated, and Mg content affects some soil physical characteristics and erodibility. The objective of this study was to establish a relationship between the distribution of clay, Mg, Ca, K and their ratios in some Nigerian soils. A total of 72 profile pits were prepared in 7 locations distributed in Niger, Edo, Oyo, Ogun and Osun States in the savanna region of Nigeria. The soils (comprising 49 Alfisols, 16 Entisols, 4 Ultisols, 2 Vertisols and 1 Inceptisol) were formed on shale/limestone, sandstones or basement complex (coarse-grained granites, coarse grained granite gneisses or amphibolites) materials. There was significant correlation among the textural separates (r2 > 0.21 < 0.96; p < 0.05 < 0.01), Ca, Mg and K content (r2 > 0.29 < 0.91; p < 0.05 < 0.01) of the soils. Correlation between clay and the ratios of exchangeable cations was significant in two locations (r2 > 0.38 < 0.77; p < 0.05 < 0.01). Regression equation established that profile distribution of clay was highly influenced by magnesium content (r2 > 0.73 < 1.00, p<0.05<0.01) of the soil and summarized for the entire locations as clay = 752.41 + 22.90(K) – 0.51(silt) – 0.76(sand) – 19.48(Ca/K) – 19.24(Mg/K) + 19.65((Ca+Mg)/K)), r2 = 0.83 and p<0.05. Mg content irrespective of the concentration of other exchangeable bases could be a strong factor in the profile distribution of clay, weathering/leaching, soil physical characteristics and stability of landscapes.

 

Keywords: Exchangeable cations, Ca:Mg:K ratios, clay migration, particle size distribution,

                   Nigerian soils

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Date:20/11/2018
 
     
 
 
 
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