Amna A. Abdalla

Agricultural Research Corporation, P. O. Box 126 Wad Medani, Sudan

Ahmed M. El Naim

Department of Crops Sciences, Faculty of Natural Resources and Environmental Studies, University of Kordofan, Elobeid, Sudan

Mahmud F. Ahmed

Department of Agronomy, Faculty of Agriculture, University of Khartoum, 13314 Shambat, Sudan

Musa B. Taha

Agricultural Research Corporation, P. O. Box 126 Wad Medani, Sudan