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Effect of Nitrogen on the Glyphosate-Induced Inhibition of Rhizome Bud Growth in Quackgrass (Elytrigia repens)

Published online by Cambridge University Press:  12 June 2017

James H. Hunter ,
Andrew I. Hsiao  and
Gordon I. Mcintyre
James H. Hunter
Affiliation:
Agric. Can. Res. Stn., Box 440, Regina, Saskatchewan, S4P 3A2, Canada
Andrew I. Hsiao
Affiliation:
Agric. Can. Res. Stn., Box 440, Regina, Saskatchewan, S4P 3A2, Canada
Gordon I. Mcintyre
Affiliation:
Agric. Can. Res. Stn., Box 440, Regina, Saskatchewan, S4P 3A2, Canada
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Abstract

In experiments conducted under controlled conditions, glyphosate-induced inhibition of rhizome bud growth in quackgrass was reduced by increasing the nitrogen (N) concentration in the nutrient solution from 10.5 to 210 mg L−1 either 2 or 4 d before foliar application of the herbicide, and for 7 d after the herbicide treatment. The additional N reduced the glyphosate-induced inhibition of rhizome growth on the intact plant at the lowest glyphosate dosage (2.8 μg per plant) but had no significant effect at higher dosages. Both the 2- and 4-d high N treatments significantly increased the length, dry weight, and water content of the lateral buds by the time the herbicide was applied. They also increased bud growth on the glyphosate-treated plants during the 7 d following the herbicide application and promoted release of the buds from inhibition during a subsequent bioassay of their regenerative growth on excised, single-node rhizome segments. These effects of N supply interacted significantly with glyphosate dosage, bud position on the rhizome, and duration of incubation. It is postulated that bud growth response to increased N supply may reduce the inhibiting effect of the herbicide by diluting the glyphosate concentration in the bud, or that the additional N may counteract the toxic action of glyphosate on amino acid metabolism or protein synthesis.

Keywords

Glyphosate, N-(phosphonomethyl) glycinequackgrass, Elytrigia repens (L.) Nevski #3 AGRRECorrelative bud inhibitionperennial weedsAGRRE
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 41 , Issue 3 , September 1993 , pp. 426 - 433
Copyright
Copyright © 1993 by the Weed Science Society of America 

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