Effect of weeding frequencies on grain amaranth (Amaranthus cruentus L.) growth and yield
1997
Ojo, D.O.
Field experiments were conducted at Ibadan, Nigeria (3 degrees 54'E, 7 degrees 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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