Muhammad Aqeel Ashraf, PhD, is a Senior Lecturer at Faculty of Science and Natural Resources, University Malaysia, Sabah. His field of interest is environmental soil science. He has published more than 100 research articles on the topic. Radiah Othman, PhD, is an Associate Professor and Head of Land Management Department, Faculty of Agriculture, University Putra Malaysia. She is an active researcher in the field of Soil Microbiology. She has published more than one hundred research articles on the topic. Che Fauzian Ishak, PhD, is a Professor and Deputy Dean (Academic, Students Affairs and Alumni), Faculty of Agriculture, University Putra Malaysia. Her field of specialization is in Soil chemistry. She conducted a project under the funding Australian Centre of International Agriculture Research (ACIAR) on the establishment of baseline levels of heavy metals in agricultural soils of Peninsular Malaysia to be used as a guideline in evaluating contaminated land in the country.