Saied El Sayed
Plant Nutrition Department National Research Centre, 33 El-Behouth St., P.O. Box 12622, Dokki, Cairo, Egypt,

Farid Hellal
Plant Nutrition Department National Research Centre, 33 El-Behouth St., P.O. Box 12622, Dokki, Cairo, Egypt,

Ahlam Ahmed Hassan
Agricultural Economy Department, National Research Centre, 33 El-Behouth St., P.O. Box 12622, Dokki, Cairo, Egypt

Mervat E. Gobarh
Field Crop Department, National Research Centre, 33 El-Behouth St., P.O. Box 12622, Dokki, Cairo, Egypt