Abstract
Field experiments were conducted at Ibadan, Nigeria (3 °54′E, 7 °30'N, 213 m a.s.l.) on naturally infested fields within the same area, using two similar adjacent fields during two early rainy seasons to determine optimal weeding frequency for weed management in grain amaranth ( Amaranthus cruentus L.). Weeding two times at 2 and 5 weeks after transplanting (WAT) was optimal for plant height, leaf number and shoot fresh weight; weeding three times at 2, 5 and 8 WAT was optimal for shoot dry weight and grain yield; while weeding four times at 2, 5, 8 and 11 WAT was optimal for grain protein content. The land used was dominated by Pennisetum purpureum L.
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