A. A. Hammadi, Abdulluh, 		Daffalla, Ahmed E., AND 		Mohamed, Ibrahim E..
" Effect of nitrogen level and time of application on growth, seed yield and oil content of Sunflower (Helianthus annuus L.), Gezira State, Sudan" <em>Gezira Journal of Agricultural Science</em> [Online], Volume 19 Number 2 (6 November 2023)