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Tolerance of Soybean (Glycine max) and Sunflower (Helianthus annuus) to Fall-Applied Dicamba

Published online by Cambridge University Press:  12 June 2017

Mark U. Magnusson  and
Donald L. Wyse
Mark U. Magnusson
Affiliation:
Dep. Agron. and Plant Genetics, Univ. Minnesota, St. Paul, MN 55108
Donald L. Wyse
Affiliation:
Dep. Agron. and Plant Genetics, Univ. Minnesota, St. Paul, MN 55108
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Abstract

The influence of fall (late September or late October)-applied dicamba (3,6-dichloro-2-methoxybenzoic acid) on spring-planted soybean [Glycine max (L.) Merr.] and sunflower (Helianthus annuus L.) was studied at five sites in Minnesota during 1983 and 1984. At the two southern Minnesota locations, only late-October applications of dicamba at the highest rate (4.5 kg ae/ha) reduced yields of spring-planted soybean and sunflower. At the central and the two northern Minnesota locations, both late-September and late-October applications of dicamba at 1.1 kg/ha and higher caused injury and yield reductions to soybean and sunflower planted the following year. The two southern Minnesota locations had generally higher levels of precipitation, higher temperatures, higher organic matter soils, and lower pH levels compared to the central and northern Minnesota locations. These climatic and soil characteristics reduced dicamba persistence at the two southern Minnesota locations.

Keywords

Herbicide persistenceherbicide dissipation
Type
Weed Control and Herbicide Technolgy
Information
Weed Science , Volume 35 , Issue 6 , November 1987 , pp. 846 - 852
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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