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Articles by E.E. Aki
Total Records ( 3 ) for E.E. Aki
  E.E. Aki , I.E. Esu and A.U. Akpan-Idiok
  Morphological, physicochemical and mineralogical properties of soils derived from Biotite-Hornblende-Gneiss of Akamkpa, Cross River State, Nigeria were studied with a view to classifying the soil taxonomically, assessing their potentials and suggesting appropriate management strategies. Three profiles were dug on the landscapes of Nsan, Okomita and Old Netim. The micro-morphological properties of soil colour, soil structure, soil consistence, drainage and root abundance were determined in the field. The soils were characterized as follows: Deep profiles (>100 cm) with texture of gravelly sandy clay loam; hues of 10-5 YR; structure of subangular peds with sticky consistence (wet); bulk density values of 0.9-1.3 mg m-3; total porosity of 52.6-64.7%; silt-clay ratios of 0.4-1. Others were soil reaction (pH 4.4-5.1) H2O; organic carbon (0.8-14.56 g kg-1); total nitrogen (0.56-1.40 g kg-1); ECEC (1.46-4.40 cmol kg-1); CEC (3.30-6.00 cmol kg-1); available P (2.70-17.56 mg kg-1); base saturation (45-47%) and minerals such as quartz (81.26%), kaolinite (11.97%) and microcline (6.77%). According to the criteria of the USDA Soil Taxonomy, the soils were classified as loamy skeletal, mixed isohyperthermic typic kandiudults. Equivalent FAO-World Reference Base for Soil Resources of the soils was Dystric Acrisol. Pedogenetic process of elluviation-illuviation reflecting the weathering process has been occurring in the soils under the humid tropical influence. The soils can be managed by planting acid tolerant crops liming and adopting appropriate cultural practices.
  I.E. Esu , A.U. Akpan-Idiok , P.I. Otigbo , E.E. Aki and K.I. Ofem
  A semi-detailed soil survey of the Okitipupa Local Government Area in Ondo State, Nigeria was carried out with the aid of Landsat-ETM satellite imagery at a scale of 1:50,000. Three soil mapping units designated as Okitipupa series, Omotosho series and Ode Erinje Fadama series were delineated and presented in a soil map. Okitipupa series occupies 41,623 ha or 52%, the Omotosho series covers 17,318 ha or 21.64% and the Ode Erinje Fadama series occupies 21,099 ha or 26.38% of the Local Government Area. All the soils have extremely to very strongly acid reaction and are nutrient impoverished. The soils also have rather sandy surface textures with sandy loam to sandy clay subsoils and are susceptible to severe surficial erosion hazard. In relative terms, the Okitipupa soil sebries which occur on nearly level landforms and are very deep may be considered as the prime agricultural lands, while the Omotosho series are marginal lands because they occur on strongly undulating landforms, are gravelly and shallow to bedrock or plinthic materials. The Ode Erinje Fadama series are seasonally flooded and are considered suitable for dry season vegetable farming and swamp rice production. According to the criteria of the USDA Soil Taxonomy System, the Okitipupa series is classified as Typic Paleudults, Omotosho series as Typic Plinthohumults and Ode Erinje Fadama series as Humaquentic Endoaquents at the subgroup level. These classifications correlate closely as Dystric Acrisols, Orthi-plinthic Acrisols and Arenic Gleysols for Okitipupa, Omotosho and Ode Erinje Fadama series respectively under FAO World Reference Base for Soil Resources.
  O.B. Iren , D.J. Udoh , V.F. Ediene and E.E. Aki
  Background and Objective: Most of the soils of South-eastern Nigeria are strongly acidic. Liming these soils for profitable crop production requires the assessment of the soil properties and then developing model equations for calculating liming rates. This study aimed to assess the soil properties and then develop model equations and curves for quick calculations of liming rates. Materials and Methods: Soil samples were collected at 40 different locations in Cross River and Akwa Ibom States and analyzed. An incubation study was also performed to monitor changes in pH bi-weekly in the laboratory. Neutralization curves were constructed by plotting a maximum rise in pH against lime rates. Results: The soils were separated into particle-size classes, A (sandy clay loam and clay soils) and B (sandy loam and loamy sand soils). Soil properties were higher for group A than B. Multiple regression equations created provided several equations for calculating Lime Requirements (LR). The equations were: Group-A: LR = 0.33+0.28ΔpHxOM+0.18ΔpHxclay [R2 = 0.855]. Group-B: LR = 0.98+0.58Δ pHxOM [R2 = 0.552]. Conclusion: Over-liming can generate alkaline conditions that may create solubility problems. Therefore, both the regression equations and the curves are useful tools for quick determinations of lime requirement.
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