"Above and Below Ground Competition for Resources in a Sesbania and Maize Agroforestry System". University of Khartoum Journal of Agricultural Sciences 17, no. 2 (ديسمبر 17, 2025). تاريخ الوصول مايو 25, 2026. https://onlinejournals.uofk.edu/uofkjas/article/view/1957.