ABSTRACT
Inadequate information on the influence of landscape on soil properties is a major factor limiting agricultural production in Nigeria. In order to characterize and evaluate four toposequences at Eha-alumona, Eastern Nigeria, soil properties were studied. On each toposequence, three profiles were sited one the on crest, mid slope and valley bottom. Standard routine analysis was carried out on the samples collected. The result showed that soil pH was consistently the least variable along the toposequence and at all depths. Highly variable properties on the upper slope (crest) include: CEC, base saturation, exchangeable H2; on the middle slope (hill slope) they were exchangeable K, CEC, base saturation and exchangeable H2; and on the toe slope (valley bottom ) they were available P. CEC, base saturation and exchangeable H2. The moderately variable properties on the middle slope were Ca, Mg, ECEC and N. For the physical properties, clay, silt and total sand were highly variable on the upper slope. Notable differences were found to exist among the various properties evaluated. Variations in soil properties exist and were due to topographic positions and horizon depths. The study also show that the midslope suffers surfacial erosion while the foot slope and the summit do not, instead, they gain organic and inorganic matter enrichment. Most properties were highly to moderately variable, thus, uniform soil management practices along the toposequence should be avoided. The soils of toposequence one were classified under USDA sub-order as Lithic Haplustults (crest), Arenic Fragiustults (mid-slope) and Aquic Kandiustults (toe slope). The soils of the toposequence 2,were classified as Arenic Kandiustults (crest), Arenic Kandiustults (mid-slope) and Arenic Kandiustults (toe slope). For toposequence 3, they were classified as Arenic Haplustults (crest), Arenic Kandiaquults (mid-slope) and Grossarenic Kandiaquults (toe slope). At the upper slope of toposequence 4, the soils were classified as Petroferric Haplustults, mid slope as Typic Kandiustults and the foot slope as Aquic Kandiustults The above soils correlate with Acrisols under FAO-UNESCO Soil Classification. Toposequence one and four were moderately suitable, while toposequence two and three were marginally suitable for arable crop production.
| Project details | Contents |
|---|---|
| Number of Pages | 83 pages |
| Chapter one | Introduction |
| Chapter two | Literature review |
| Chapter three | methodology |
| Chapter four | Data analysis |
| Chapter five | Summary,discussion & recommendations |
| Reference | Reference |
| Questionnaire | Questionnaire |
| Appendix | Appendix |
| Chapter summary | 1 to 5 chapters |
| Available document | PDF and MS-word format |
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