1- Professor Mohamed Osman Khider, Dept. of Agronomy, Faculty of Agric., University of Khartoum, Sudan.

      2- Professor MUKHTAR A. Mustafa, Chair holder of UNESCO Chair on Desertification, University of Khartoum

      3- Professor Hamid O. Burhan. Consultant at the AAAID, Khartoum, Sudan.

       4- Professor Robert, M. Dixon, USDA, Tucson, AZ  85719, USA