1. a Department of Natural Resources and the Environment, Faculty of Agriculture , University of Science and Technology , P.O. Box 3030, Irbid , Jordan E-mail:
2. b Deir Alla Regional Agricultural Research Center , Deir Alla , Jodan Valley , Jordan
3. c Department of Natural Resources and the Environment, Faculty of Agriculture , University of Science and Technology , P.O. Box 3030, Irbid , Jordan