Effect of Weeding Frequencies on Growth and Yield of Two Roselle (Hibiscus sabdariffa L) Varieties under Rain Fed

Fields experiments were conducted at North Kordofan state, Sudan, on naturally infested fields within the same area, using three similar fields during 2008/2009 rainy season, to determine optimal weeding frequency for weeding management in two widely used cultivated varieties of Hibiscus sabdariffa L, (Elrahad and Elfashir). The weeding (hand hoeing) treatments consisted of four levels (no weeding, weeding once (at 2weeks), weeding twice (at 2 and 3 weeks) and weeding three times (at 2, 4 and 6 weeks after sowing). Weeding three times at 2, 4 and 6 weeks after sowing was optimal for plant height, leaf area index, number of branches, number of calyces per plant, calyx diameter and. calyces yield per unit area. Elfahsir variety was a superior in all frequencies of weeding. The land used was dominated by Cenchrus biflours L