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Response of Soybean to Combinations of Clomazone, Metribuzin, Linuron, Alachlor, and Atrazine

Published online by Cambridge University Press:  12 June 2017

Frederick P. Salzman  and
Karen A. Renner
Frederick P. Salzman
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., E. Lansing 48824
Karen A. Renner
Affiliation:
Dep. Crop and Soil Sci., Michigan State Univ., E. Lansing 48824
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Abstract

Field observations in 1986 indicated that increased injury to soybean could occur from clomazone plus metribuzin and clomazone plus linuron compared with metribuzin or linuron alone. Field experiments to measure this response were conducted in 1988, 1989, and 1990 at two locations in Michigan. Atrazine at 0, 1120, 2240, and 3360 g ha-1 was applied the year previous to soybean planting to determine if atrazine residues in the soil influenced soybean response. Herbicide treatments in soybean included clomazone, metribuzin, linuron, alachlor, clomazone plus metribuzin or linuron, alachlor plus metribuzin or linuron, and an untreated control. Additive and synergistic responses in soybean to clomazone plus linuron and clomazone plus metribuzin, regardless of atrazine application rate, occurred in some field environments. Experiments in the greenhouse demonstrated that soybean shoot weight was reduced synergistically from clomazone plus metribuzin compared with either herbicide alone, and the response was greater on a soil with 2.5% organic matter compared with a soil with 4.4% organic matter. Clomazone plus metribuzin reduced leaf area and shoot dry weight, regardless of placement, while leaf area and shoot dry weight were reduced more when clomazone plus linuron- and atrazine plus metribuzin-treated soil was placed in the same zone as the soybean seed. The synergistic interaction in soybean to clomazone plus metribuzin occurred under both cool and warm temperature regimes in growth chamber studies.

Keywords

Alachlor, 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamideatrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diamineclomazone, 2-[(2-chlorophenyl)methyl]-4,4-dimethyl-3-isoxazolidinonelinuron, N′-(3,4-dichlorophenyl)-N-methoxy-N-methylureametribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-l,2,4-triazin-5(4H)-onesoybean, Glycine max (L.) Merr. ‘Century’Temperatureherbicide placementsynergistic interaction
Type
Research
Information
Weed Technology , Volume 6 , Issue 4 , December 1992 , pp. 922 - 929
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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