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Physiological Basis for Reduced Glyphosate Efficacy on Weeds Grown Under Low Soil Nitrogen

Published online by Cambridge University Press:  20 January 2017

J. Mithila ,
C. J. Swanton ,
R. E. Blackshaw ,
R. J. Cathcart  and
J. Christopher Hall
J. Mithila
Affiliation:
University of Guelph, Guelph, ON, Canada N1G 2W1
C. J. Swanton
Affiliation:
University of Guelph, Guelph, ON, Canada N1G 2W1
R. E. Blackshaw
Affiliation:
AAFC, Lethbridge Research Centre, Lethbridge, AB, Canada T1J 4B1
R. J. Cathcart
Affiliation:
Alberta Agricultural Food and Rural Development, Edmonton, AB, Canada T6H 5T6
J. Christopher Hall*
Affiliation:
University of Guelph, Guelph, ON, Canada N1G 2W1
*
Corresponding author's E-mail: jchall@uoguelph.ca
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Abstract

Growth room studies were conducted to determine the physiological basis of reduced glyphosate efficacy under low soil nitrogen using velvetleaf, common ragweed, and common lambsquarters as model species. Glyphosate dose–response experiments of weeds grown under low (1.5 mM) and high (15 mM) soil N were conducted. Velvetleaf and common lambsquarters grown under low N required 169 g ae ha−1 glyphosate for a significant reduction in biomass, but only 84 g ae ha−1 were required when grown under high N. However, when common ragweed was grown under low or high soil N there was no significant difference in response to glyphosate at all doses tested. The reduced glyphosate efficacy on velvetleaf and common lambsquarters under low N was primarily due to decreased herbicide translocation to the meristem. It appears that low N may decrease the net assimilation of carbon in plants, resulting in a decrease in the net export of sugars and hence glyphosate from mature leaves. Understanding the relationship between soil N and herbicide efficacy may help explain observed weed control failures with glyphosate and may contribute to our knowledge of the occurrence of weed patchiness in fields. This is the first report illustrating a physiological basis for decreased glyphosate efficacy under low soil N in selected weed species.

Keywords

Glyphosatevelvetleaf, Abutilon theophrasti Medic. ABUTHcommon lambsquarters, Chenopodium album L. CHEALcommon ragweed Ambrosia artemisiifolia L. AMBEL.Glyphosateefficacyherbicide translocationnet carbon assimilationnitrogen concentrationphotoassimilates
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 56 , Issue 1 , February 2008 , pp. 12 - 17
Copyright
Copyright © Weed Science Society of America 

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