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The Use of Paraquat to Improve Pastures in Manitoba

Published online by Cambridge University Press:  12 June 2017

G. G. Bowes  and
George Friesen
George Friesen
Affiliation:
Department of Plant Science, University of Manitoba, Winnipeg, Manitoba, Canada
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Abstract

Three experiments were conducted over a period of 2 years on native grasslands in an attempt to suppress or control the resident vegetation to permit the establishment of alfalfa. Spring applications of 1,1′-dimethyl-4,4’ bipyridilium salt (paraquat) at 1 lb/A were effective in suppressing the existing grasses and forbs, thereby enhancing alfalfa establishment; however, woody perennials were not effectively controlled. Application of a mixture of 2,4-dichlorophenoxyacetic acid(butyl ester of 2,4-D) and 2,4,5-trichlorophenoxyacetic acid (iso-octyl ester of 2,4,5-T) (2:1 ratio) at 1½ lb/A prior to paraquat treatments and alfalfa seeding also was ineffective in controlling woody perennials. Alfalfa could not be successfully established when seeded 6 days after the application of phenoxy herbicides. Fall applications of paraquat at rates up to 1.5 lb/A were not effective in suppressing the resident vegetation; thus, alfalfa seeded in the following spring failed to establish an adequate stand.

Type
Research Article
Information
Weeds , Volume 15 , Issue 3 , July 1967 , pp. 241 - 243
Copyright
Copyright © 1967 Weed Science Society of America 

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References

Literature Cited

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