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Grain sorghum ( Sorghum vulgare Pers.) was grown in combination with varying densities and durations of yellow foxtail ( Setaria glauca (L.) Beauv.) during 1963-1965 at Manhattan, Kansas. Weed yield and competitive influence were greatest during the year of above-average rainfall and supplemental N fertility. Reduction in sorghum grain yield was due principally to a reduction in number of seeds per head. A 16-inch weed band on the crop row reduced soil moisture more than any other density treatment, but lesser weed densities reduced soil moisture below that of weed-free plots.
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Feltner et al. (1969) studied this question.
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