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Hamad, A.A. and Lolas, .P.C. 2023. Critical Period of Weed Control in Cotton (Gossypium hirsutum L.) at Three Nitrogen Levels*. University of Khartoum Journal of Agricultural Sciences. 19, 3 (Mar. 2023). DOI:https://doi.org/10.53332/uofkjas.v19i3.1880.