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Effect of Land Uses on Soil Erodibility in the Njala Area of Southern Sierra Leone

Open Journal of Soil Science 2022年第10期12卷 475-489页

作者： Denis Magnus Ken Amara Ibrahim Benya Sheku Alfred Kanu Daniel Hindogbe Saidu Raymond Morie Musa Osman Sidie Vonu Fayia Brima Joseph Christian Adamu Mboma Michael Jusu Foday Turay abdulai kamara Department of Soil Science School of Agriculture & Food Sciences Njala University Njala Campus Njala Sierra Leone Department of Soil Science Faculty of Development Agriculture & Natural Resources Management Eastern Technical University of Sierra Leone Private Mail Bag Kenema Sierra Leone Project Management Office Mamour Agricultural Foundation Freetown Sierra Leone Department of Crop Science School of Agriculture & Food Sciences Njala University Njala Campus Sierra Leone Department of Agriculture Food Security & Livelihood Sustainable Cassava Commercialization through Entrepreneurs Strengthening & Support (SUCCESS) Project Bangladeshi Rural Agro Committee (BRAC) Bo Sierra Leone Department of Agricultural Education Faculty of Education Eastern Technical University of Sierra Leone Kenema Sierra Leone Department of Social Studies Faculty of Education Eastern Technical University of Sierra Leone Kenema Sierra Leone Department of Agriculture & Forestry Faculty of Development Agriculture & Natural Resources Management Eastern Technical University of Sierra Leone Kenema Sierra Leone Department of Agricultural Engineering Faculty of Development Agriculture & Natural Resources Management Eastern Technical University of Sierra Leone Kenema Sierra Leone

Soil loss through erosion continues to pose serious challenges to increasing the smallholder agricultural productivity in Sierra Leone. While emphasis on sustainable land use practices continue to gain attention among land users, however, the rate of adoption among smallholder farmers is still very low and hence, in most part of the country soil fertility has been declining at alarming rates. In the Njala area, studies have shown that soil loss ranges from moderate to high. Though soil erosion has been identified as a major soil fertility declining factor, however, the effect of land use practices on the inherent resistance of soil materials to erosion is lacking. This study was therefore conducted to assess the effect of land uses on soil erodibility. The results showed that the soils are coarse sandy loam with high sand content. The dispersion ratios and erosion indices of soils under cassava, plantain, maize and guava were above the minimum thresholds of 15.0 and 10.0 respectively, thus indicating that these soils are highly erodible compared to soils under fallow and sweet potato which have dispersion ratios and erosion indices below the minimum thresholds. Clay content was inversely proportional to and significantly correlated with dispersion ratio and erosion index while the correlations between silt + clay, dispersion ration and erosion index, and silt, silt + clay and dispersion ratio were negative and non-significant. Considering the coarse nature of soils, landscape features and high erodibility indices, these soils would need special soil and water conservation practices to counter further degradation. These may include following, agroforestry, silvi-pasture, controlled and rotational grazing. In addition, awareness of sense of self-responsibility and forest policies and regulations are needed.

关键词： Soil Erosion Land Use Agriculture Smallholders Soil Texture Erodibility Soil Fertility Deforestation

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A Grobner Bases Approach to the Detection of Improperly Parameterized Rational Curve

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American Journal of Computational Mathematics 2013年第1期3卷 48-52页

作者： Amadu Fullah kamara Mohamed abdulai Koroma Department of Mathematics Faculty of Pure and Applied Sciences Fourah Bay College University of Sierra Leone Freetown Sierra Leone Department of Mathematics Harbin Institute of Technology Harbin China Department of Mathematics University of Science and Technology of China Hefei China Department of Mathematics Faculty of Pure and Applied Sciences Fourah Bay College University of Sierra Leone Freetown Sierra Leone

This paper proposes an algorithm for the detection of improper parameterization of rational curves using the concept of Grobner bases. The advantage of the proposed algorithm lies in the fact that the Grobner bases ca... 详细信息

关键词： Grobner Bases Resultant Field Parameterization

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Improved Conditions for the Existence and Uniqueness of Solutions to the General Equality Constrained Quadratic Programming Problem

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Open Journal of Optimization 2012年第2期1卷 15-19页

作者： Amadu Fullah kamara Mohamed abdulai Koroma Mujahid Abd Elmjed M.-Ali Department of Mathematics Faculty of Education Kassala University Kassala Sudan Department of Mathematics Faculty of Pure and Applied Sciences Fourah Bay CollegeUniversity of Sierra Leone Freetown Sierra Leone Department of Mathematics University of Science and Technology of China Hefei China

This paper presents an approach that directly utilizes the Hessian matrix to investigate the existence and uniqueness of global solutions for the ECQP problem. The novel features of this proposed algorithm are its uniqueness and faster rate of convergence to the solution. The merit of this algorithm is base on cost, accuracy and number of operations.

关键词： Hessian Matrix Global Solutions Equality Constrained Quadratic Programming Existence and Uniqueness of Solutions Lagrangian Methods Schur Complement Methods

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