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Weed Control from Imazaquin and Metolachlor in No-till Soybeans (Glycine max)

Published online by Cambridge University Press:  12 June 2017

Douglas D. Buhler  and
Virginia L. Werling
Douglas D. Buhler
Affiliation:
Dep. Agron., Univ. Wisconsin, Madison, WI 53706
Virginia L. Werling
Affiliation:
Dep. Agron., Univ. Wisconsin, Madison, WI 53706
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Abstract

In 1985, when weed densities were low (169 plants/m2 in untreated control), imazaquin applied at 0.07 kg ai/ha early preplant controlled over 90% of all weeds before no-till planting of soybeans. In 1986 and 1987 when weed densities were higher (589 plants/m2 in untreated control), addition of 1.1 kg ai/ha or more of metolachlor to imazaquin (0.07 kg/ha) before soybean planting controlled 95% or more of the grass weeds and 83% or more of the broadleaf weeds. Imazaquin plus metolachlor applied less than 1 day after soybean planting controlled less than 70% of the emerged weeds in 1986 and 1987; common lambsquarters was most tolerant. Early preplant treatments controlled more weeds throughout the growing season than treatments applied after planting. Splitting herbicide treatments among application times generally did not increase weed control compared to single applications. Early preplant applications resulted in higher soybean densities and taller soybeans 30 days after planting in 1986 and 1987 than treatments applied after planting. Soybean yields increased as weed control increased. Weed control and soybean yields were greater with early preplant treatments than paraquat plus alachlor plus metribuzin applied preemergence in 1986 and 1987. No carryover of imazaquin residue was detected through corn bioassay in the field.

Keywords

Alachlor, 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetainideimazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidmetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamidemetribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-oneparaquat, 1,1′-dimethyl-4,4′-bipyridinium ioncommon lambsquarters, Chenopodium album L. ♯3 CHEAL;: corn, Zea mays L. ‘Pioneer 3747′soybean, Glycine max (L.) Merr.Conservation tillageearly preplantherbicide carryoverAbutilon theophrasti MedikAmaranthus retroflexus L.Chenopodium album L.Polygonum persicaria L.Setaria faberi HerrmABUTHAMARECHEALPOLPESETFA
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 37 , Issue 3 , May 1989 , pp. 392 - 399
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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