Many herbicide options for soybean comprise multiple herbicide active ingredients to broaden the spectrum of weed species the product will control. Herbicides are also combined to include additional herbicide modes of action so that development of herbicide-resistant weeds can be prevented or delayed. Knowing the amount of the individual herbicides in the pre-mix is useful for deciding if additional product should be applied to further improve weed control.

The following table lists several pre-mix herbicides that are labeled for use in soybean and the equivalent rates of the individual herbicide components. Use rates for pre-mix herbicides are based on label recommendations for medium texture soils with 1.5 percent organic matter and pH of 6.5. Use rates can vary depending on soil characteristics and planned follow-up herbicide applications. Before using any herbicide, always consult the label for appropriate rates, tank-mix partners, plant-back intervals, geographic restrictions, and other special instructions.

*All equivalent rates of glyphosate are based on a 3 lb. acid equivalent per gallon formulation.

Abbreviations:
oz = ounce        ae = acid equivalent
fl oz = fluid ounce        DF = dry flowable
pt = pint        DG = dry granule
qt = quart         EC = emulsifiable concentrate
lb = pound        SG =  soluble granule

Additional resources
For more information on herbicide modes of action, please see OSU Extension Fact Sheet PSS-2778 “Understanding Herbicide Mode of Action.”

Misha Manuchehri
Extension Weed Science Specialist