Journal of Soil Science and Environmental Management 2141-2391 Academic Journals 10.5897/JSSEM.9000069 S. Mustapha H. K. Mamman N. A. Abdulhamid * E-mail: shafiumusty@yahoo.com 2010 30 11 2010 23 09 2010 1 8 200 204 This is an open-access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from https://academicjournals.org/journal/JSSEM/article-abstract/292B23410167 The full text article is available as a PDF file from https://academicjournals.org/journal/JSSEM/article-full-text-pdf/292B23410167