Peanut (Arachis hypogaeaL. ‘Florigiant’) seed yield was reduced 25% by a fall panicum (Panicum dichotomiflorumMichx.) density of one weed per 4.9 m of row. Greater weed densities resulted in greater yield losses. Peanut seed yield was reduced by fall panicum interference for 2 weeks or more after peanut emergence. Peanuts kept weed-free for 8 weeks after emergence failed to yield as well as those kept weed-free all season. However, control for the first 2 weeks appeared to be the most critical.
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York et al. (1977) studied this question.
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