Affordable Access

Access to the full text

Suitability of Universal Soil Loss Erodibility, Inter-rill and Rill Erodibility Models for Selected Tropical Soils

Authors
  • Oshunsanya, Suarau Odutola
  • Nwosu, Nkem Joseph
Type
Published Article
Journal
Agricultura Tropica et Subtropica
Publisher
De Gruyter Open
Publication Date
Dec 01, 2017
Volume
50
Issue
4
Pages
191–198
Identifiers
DOI: 10.1515/ats-2017-0020
Source
De Gruyter
Keywords
License
Green

Abstract

The universal soil loss equation (USLE) and water erosion prediction project (WEPP) (inter-rill and rill) erodibility factors are important indicators for land degradation assessment all over the world, which were primarily developed for the United States of America (USA). However, information on suitability of USLE and WEPP for tropical environment is scarce. Therefore, studies were carried out to investigate the suitability of USLE and WEPP for selected tropical soils of Southwestern Nigeria. Four pedons classified based on USDA soil taxonomy as Plinthic Petraquept (Adio series), Kanhaplic Haplaustalf (Oyo series), Typic Plinthustalf (Temidire series) and Typic Haplaustalf (Owutu series) were used for the study. Soil erodibility factor was determined using USLE and WEPP models. Origin-Pro. 8.1 software was employed to compare USLE and WEPP models for conformity and suitability. The results showed perfect agreement (R2 = 1.0; P < 0.001) between the two WEPP (inter-rill and rill) erodibility models in all the four soil types investigated. In addition, WEPP models (inter-rill and rill erodibility) significantly (R2 = 0.82; P < 0.001) related to USLE (El-Swaify and Dangler, 1977) erodibility model. There was a poor relationship (R2 = 0.46; P < 0.06) between USLE (Wischmeier and Mannering, 1968) and the WEPP erodibility factors. The WEPP erodibility models with a perfect relationship with soil properties of the four soil types are more suitable than USLE models for predicting soil erodibility of the identified soil types in tropical environments.

Report this publication

Statistics

Seen <100 times