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VARIATION OF SOIL CHEMICAL PROPERTIES OVER NIGERIAN SAVANNA (1996)

Jaiyeoba, I.A.

Oxford, UK : Blackwell Publishing Ltd

Singapore journal of tropical geography 16 (1996), S. 0

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ISSN: 1467-9493

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geography

Notes: An analysis of relationships between selected soil chemical properties and parameters of parent material, climate and relief was undertaken for the savanna of north central Nigeria. Step by step examination of individual properties and the environmental parameters reveals numerous invariably disparate relationships often explicable in terms of local conditions. However, an analysis of covariance involving all variables shows that variations in base elements and cation exchange capacity are more strongly related to lithology than climatic or relief parameters. Soil pH and base saturation percentage, on the other hand, are influenced more by rainfall than parent material, altitude and slope position. Temperature and slope gradient are relatively unimportant in the variability of all soil properties. On the whole, the soil properties show significantly greater values over basalt, shale and alluvium than gneiss, schist and colluvium which in turn show greater values than sandstone, granite, granite gneiss, aeolian and ironpan-rich deposits. Exchangeable cations and cation exchange capacity increase with an increase in rainfall, altitude and downslope position while pH and base saturation per cent show a decreasing trend.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1467-9493.1995.tb00073.x

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Changes in soil properties related to different land uses in part of the Nigerian semi-arid Savannah (1995)

Jaiyeoba, I.A.

Oxford, UK : Blackwell Publishing Ltd

Soil use and management 11 (1995), S. 0

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ISSN: 1475-2743

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract. Changes in soil physical and chemical properties associated with different land uses including natural savannah were compared in Nigeria. The study was conducted on large unreplicated sites. There was a significant coarsening of texture, depletion of organic matter and nutrients and increase in bulk density under Eucalyptus camaldulensis and Mangifera indica (mango) plantations, and also under arable and fallow conditions compared with under natural vegetation. The soil conditions were slightly better under Mangifera than under Eucalyptus, and in the fallow land than the arable land and tree plantations, but the differences were mostly non-significant. The land uses studied were less efficient than the natural savannah in protecting the soil from loss of organic matter and nutrients by offtake or surface washing. The options open to Nigerian smallholder fanners are discussed in relation to sustaining soil fertility and productivity.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1475-2743.1995.tb00501.x

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