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IJSTR >> Volume 8 - Issue 1, January 2019 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Pedological Classification Of Soils Along A Toposequence In Faculty Of Agriculture Shabu-Lafia Campus, Nasarawa State University Keffi, Nigeria.

[Full Text]



Abubakar, M. A., Daar, W. J. Jayeoba, O. J.



Digital Elevation Model, soil classification, soil properties and toposequence.



This study was conducted along a toposequence in faculty of agriculture Nasarawa State University Shabu-Lafia Campus (8° 33' 22.07'' N and 8° 34' 00.49'' N and longitude 8°32' 37.63'' E and 8° 33' 14.07'' E) Nigeria. Digital Elevation Model (DEM) of the study site was developed using Google earth map and GIS software (Arch GIS 10.3 version) and the site was divided into three slope classes (upper, middle and lower). Morphologically the upper and middle slope soils were deep (200 cm) and well drained while lower slope soils was moderately deep (90 cm) and poorly drained. Soil colour ranged from 10YR3/4, 10YR4/4 and 5YR5/1 in the surface horizons of upper, middle and lower slope landscape position to 2.5YR4/8, 7.5YR7/8 and 2.5YR6/1 in the underlying horizons. Bulk density values across the study area were generally high (1.52-1.62 gcm-3) and sand dominated the particle size fraction (648-848 gkg-1), then Clay (98-278 gkg-1) and finally silt. Soil reaction (pH) varied as strongly acid to moderately acid (4.67-5.73) and the soils were non saline (3.1-1.0 dSm-1), Ca dominated the exchangeable bases and were in the order Ca > Mg > K > Na, CEC were low across the three landscape position and percentage base saturation were high (73.0- 80 %). Available P were generally high (36.1-28.8 mgkg-1), OC were moderate (10.1-14.0 gkg-1), TN were moderate too (2.1-2.8 gkg-1). The soils were classified as Typic Endoustalfs and Typic Endoaquents according to USDA Taxonomy while Haplic Acrisols (skeletic, Eutric) and Haplic Gleysols (Eutric, Colluvic) according to WRB.



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