Herbicidal Effects of Ethyl Acetate Extracts of Billygoat Weed (Ageratum conyzoides L.) on Spiny Amaranth (Amaranthus spinosus L.) Growth. - Erida, Gina; Saidi, Nurdin; Hasanuddin, Hasanuddin; Syafruddin, Syafruddin (Agronomy, 2021)