ANALYSIS OF THE RELATIONSHIP BETWEEN SOIL PROPERTIES AND SOIL FORMING-FACTORS IN THE NIGERIAN SAVANNA

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dc.contributor.authorJAYEOBA, IDRIS AUDU
dc.date.accessioned2014-06-23T11:19:59Z
dc.date.available2014-06-23T11:19:59Z
dc.date.issued1986-09
dc.descriptionA THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL, AHMADU BELLO UNIVERSITY, ZARIA, IN PARTIAL FULFILMENT OF THE REQUIREMENT FOR THE DEGREE OF DOCTOR OF PHILOSOPHY. DEPARTMENT OF GEOGRAPHY FACULTY OF SCIENCE AHMADU BELLO UNIVERSITY ZARIA SEPTEMBER, 1986en_US
dc.description.abstractAn examination of the status and the relationships between key soil properties and the soil-forming factors of climate, parent material and relief, under savanna environment, form the primary objectives of this study. The data used wore obtain mainly from the noral land resource survey covering; north central nigeria.The survey was carried out by the Land Resoure Division, British Ministry of Overseas Development, and covers an area of about 230,000km . Selection of profiles from the survey data were based on their wide range of characteristics, representative of soils within particular geomcrphic units, and availability of information on some of the soil-form in g factors considered, -»7hich arc missing from the land resource survey data. All together, 385 pro files were selected. The method of analysis of the spatial variability of the soil properties cantered on the use of simple line arregression analysis, in respect of factors with interval data, and one-way analysis of variance for those at normal level and also interval level, following a preliminary conversion onto ordinal. In nearly all the samples considered, tho paticle-size distribution reveals the presence of a maximum of sand and / and minima of silt/clay. On the whole, however, the subsoils Sandy and more clayey than the top soils. The soilsare generally low in organic matter, total nitrogen, and exchangeable base (K, Na, Mg & Oft) content except soils formed from basalt and shale and over somo tasal slope positions which have moro than average values, ..rcflecting presumably the low organic matter and clay contents, the CEC values are low and the soil reaction weakly to moderately acid. The soil structural units are predominantly moderately dove loped but the soils themselves show little compaction and are characterized by relatively high effective depth. Stop by stop examination of individual soil properties and the soil-forming factors reveals numerious .invariably disperate relationships often explicable only in terms of local conditions. However, by combining all the variables involved in an analysis of variance and covariance, the results seem to suggest that the variability of virtually all the Soil properties considered, except the PH, | ' the fine sand subfraction which are mere strongly related to the rainfall factor, are better explained in terms of the material factor than in terns of the other factors. Apart from being the major factor controlling the pH, %BS and the fine sand, the rain fall factor is also, important in the variability of most of the other properties, particularly the organic total nitrogen, bulk density and clay, and thus the CEC of the soils. The organic carbon, fine sand, %BS show stronger. correlation with altitude than the other properties. Slope position is more important in the variability of the organic carbon, total nitrogen, sand, clay, CEC, %BS and bulk density than of the other properties-. By contrast, the temperature and slope gradient factors play relatively minor roles in the spatial variability of the soil properties considered, except the soil effective depth in respect of the second factoren_US
dc.identifier.urihttp://hdl.handle.net/123456789/4975
dc.language.isoenen_US
dc.subjectANALYSIS,en_US
dc.subjectRELATIONSHIP,en_US
dc.subjectSOIL PROPERTIES,en_US
dc.subjectSOIL FORMING-FACTORS,en_US
dc.subjectNIGERIAN SAVANNAen_US
dc.titleANALYSIS OF THE RELATIONSHIP BETWEEN SOIL PROPERTIES AND SOIL FORMING-FACTORS IN THE NIGERIAN SAVANNAen_US
dc.typeThesisen_US
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