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Barnyardgrass (Echinochloa crus-galli) Interference in Soybeans (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Gordon D. Vail and
Lawrence R. Oliver
Gordon D. Vail
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701
Lawrence R. Oliver
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701
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Abstract

A 2-yr field experiment was conducted at Fayetteville and Stuttgart, AR, to predict soybean yield loss as a function of barnyardgrass density and total dry weight. Predicted soybean yield reductions were 0 to 78% for original densities of 1 to 500 barnyardgrass plants per m of row. Soybean yield reductions were linear from 0 to 150 barnyardgrass plants per m of row with an average yield reduction of 0.25% for each plant per m of row. Soybean yield was reduced 10, 25, and 50% from original barnyardgrass densities of 42, 110, and 250 plants m of row. Predictions of soybean yield reduction from barnyardgrass dry weight and original density were similar. traspecific interference of barnyardgrass occurred for all variables tested, with individual barnyardgrass plants becoming less competitive as density increased.

Keywords

Barnyardgrass, Echinochloa crus-galli (L.) Beauv. # ECHCGsoybean Glycine max (L.) Merr.DensitycompetitionECHCG

Information

Type
Research
Information
Weed Technology , Volume 7 , Issue 1 , March 1993, pp. 220 - 225
Copyright
Copyright © 1993 by the Weed Science Society of America 

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