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Interference of Three Annual Grasses with Grain Sorghum (Sorghum bicolor)

  • Brenda S. Smith (a1), Don S. Murray (a1), J. D. Green (a1), Wan M. Wanyahaya (a1) and David L. Weeks (a2)...

Abstract

Barnyardgrass, large crabgrass, and Texas panicum were evaluated in field experiments over 3 yr to measure their duration of interference and density on grain sorghum yield. When grain yield data were converted to a percentage of the weed-free control, linear regression predicted a 3.6% yield loss for each week of weed interference regardless of year or grass species. Grain sorghum grown in a narrow (61-cm) row spacing was affected little by full-season interference; however, in wide (91-cm) rows, interference increased as grass density increased. Data from the wide-row spacing were described by linear regression following conversion of grain yield to percentages and weed density to log10. A separate nonlinear model also was derived which could predict the effect of weed density on grain sorghum yield.

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Keywords

Interference of Three Annual Grasses with Grain Sorghum (Sorghum bicolor)

  • Brenda S. Smith (a1), Don S. Murray (a1), J. D. Green (a1), Wan M. Wanyahaya (a1) and David L. Weeks (a2)...

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