SAKHRAOUI, ANIS, Department of Agricultural Production - Laboratory of Agricultural Production Systems and Sustainable Development (SPADD), LR03AGR02, Higher School of Agriculture of Mograne, Carthage University, 1121 Mograne, Zaghouan, Tunisia. Higher School of Agriculture of Kef, University of Jendouba, 7119 Le Kef-Tunisia. Departamento de Biología Vegetal y Ecología, Universidad de Sevilla, Apartado 1095, 41080 Sevilla, Spain., Tunisia