A. A. HAMMADI, Abdulluh; 						DAFFALLA, Ahmed E.; 						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.
<strong>Gezira Journal of Agricultural Science</strong>, [S.l.], v. 19, n. 2, p. 15-28, nov. 2023.
ISSN 1728-9556. Available at: &lt;<a href="http://journals.uofg.edu.sd/index.php/gjas/article/view/2025" target="_new">http://journals.uofg.edu.sd/index.php/gjas/article/view/2025</a>&gt;. Date accessed: 21 july 2026.