1. a Soil and Land Use Management Department , Environment Agency-Abu Dhabi (EAD) , Abu Dhabi , United Arab Emirates
2. b Soils and Water Sciences Department, Faculty of Agriculture , Fayoum University , Fayoum , Egypt
3. c MED-Soil Research Group, Departamento de Cristalografía, Mineralogía y Química Agrícola , Facultad de Química (Universidad de Sevilla) , Calle Profesor García González s/n.41012, Sevilla , Spain