Ahmed, Imran, 		Ahmed, Mahamuod, AND 		Hamad, Muawia.
" Direct and residual effects of chicken manure on soil air dry bulk density and moisture content of a desert plain soil and wheat (Triticum aestivum  L.) yield, Northern State, Sudan" <em>Gezira Journal of Agricultural Science</em> [Online], Volume 16 Number 1 (1 June 2018)