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

Published online by Cambridge University Press:  12 June 2017

Brenda S. Smith ,
Don S. Murray ,
J. D. Green ,
Wan M. Wanyahaya  and
David L. Weeks
Brenda S. Smith
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
Don S. Murray
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
J. D. Green
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
Wan M. Wanyahaya
Affiliation:
Dep. Agron., Oklahoma State Univ., Stillwater, OK 74078
David L. Weeks
Affiliation:
Dep. Stat., Oklahoma State Univ., Stillwater, OK 74078
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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.

Keywords

Barnyardgrass, Echinochloa crus-galli (L.) Beauv. ♯3 ECHCGlarge crabgrass, Digitaria sanguinalis (L.) Scop. ♯ DIGSATexas panicum, Panicum texanum Buckl. ♯ PANTEgrain sorghum, Sorghum bicolor (L.) Moench. ‘Acco 4012R’ and ‘Funk G-623 GBR’Competitiondurationdensitycritical periodrow spacingECHCGDIGSAPANTE
Type
Research
Information
Weed Technology , Volume 4 , Issue 2 , June 1990 , pp. 245 - 249
Copyright
Copyright © 1990 Weed Science Society of America 

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References

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