Mukhtar, Salaheldin, 		Adam, Adam, 		Ibrahim, Abu Elhassan, AND 		Hamad, Muawia.
" Effect of nitrogen and zinc plus copper on sugarcane (Saccharum spp) plant crop in Guneid and Assalaya Sugar Estates, in central Sudan" <em>Gezira Journal of Agricultural Science</em> [Online], Volume 8 Number 1 (1 January 2010)