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Effects of Preemergence Herbicides on Soybean (Glycine max): Weed Competition

Published online by Cambridge University Press:  12 June 2017

Timothy E. Adcock ,
Philip A. Banks  and
David C. Bridges
Timothy E. Adcock
Affiliation:
Dep. Agron., Univ. Georgia, Athens, GA 30602
Philip A. Banks
Affiliation:
Dep. Agron., Univ. Georgia, Athens, GA 30602
David C. Bridges
Affiliation:
Georgia Exp. Stn., Griffin, GA 30223
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Abstract

Glasshouse experiments were conducted to evaluate the effects of preemergence applications of metribuzin, pendimethalin, alachlor, and imazaquin on the competitive relationship between soybean and sicklepod, tall morningglory, or common cocklebur. An equal-ratio series design was employed where the proportion of species in a mixture remained constant and total plant density was varied. The ratio of soybean:sicklepod fresh weights was altered by alachlor and imazaquin while the ratio of soybean:tall morningglory fresh weights was altered only by imazaquin. The ratio of soybean:common cocklebur fresh weights was altered by metribuzin and imazaquin. Increasing herbicide rates resulted in higher soybean:weed fresh weight ratios and higher herbicide response coefficients.

Keywords

Metribuzin, 4-amino-6- (1,1-dimethylethyl)-3-(methylthio) - 1,2,4-triazin-5(4H)-onependimethalin, N-(1-ethylpropyl)-3,4-dimethyl-2,6-dinitrobenzenaminealachlor, 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamideimazaquin, 2-[4,5-dihydro - 4 - methyl - 4 - (1-(methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidsoybean, Glycine max (L.) Merr. ‘Gordon’sicklepod, Cassia obtusifolia L. ♯ CASOBtall morningglory, Ipomoea purpurea (L.) Roth. ♯ PHBPUcommon cocklebur, Xanthium strumarium L. ♯ XANSTCompetitionequal-ratio seriesherbicide response coefficientCASOBPHBPUXANST
Type
Weed Biology and Ecology
Information
Weed Science , Volume 38 , Issue 2 , March 1990 , pp. 108 - 112
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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