Hamad, A. A. ., and . P. C. . Lolas. “Critical Period of Weed Control in Cotton (Gossypium Hirsutum L.) at Three Nitrogen Levels*”. University of Khartoum Journal of Agricultural Sciences, vol. 19, no. 3, Mar. 2023, doi:10.53332/uofkjas.v19i3.1880.