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The Long-Term Effect of Picloram and Its Residue on Grain Production and Weed Control

Published online by Cambridge University Press:  12 June 2017

K. J. Kirkland  and
C. H. Keys
K. J. Kirkland
Affiliation:
Exp. Farm, Agric. Canada, Scott, Saskatchewan, SOK 4AO Canada
C. H. Keys
Affiliation:
Exp. Farm, Agric. Canada, Scott, Saskatchewan, SOK 4AO Canada
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Abstract

The persistence of picloram (4-amino-3,5,6-trichloropicolinic acid) was measured each spring over an 8-yr period following repeated annual applications at rates ranging from 0.020 to 0.070 kg/ha. Picloram residue levels were proportional to rate of application but averaged approximately 45% of the original levels when measured 12 months following application and declined to 10% 24 months after application ceased. Control of wild buckwheat (Polygonum convolvulus L.) was good with major population declines over the test period. Crop tolerance and yields were not affected at rates of 0.035 kg/ha or less.

Keywords

Triticum aestivumbioassaytolerance
Type
Research Article
Information
Weed Science , Volume 27 , Issue 5 , September 1979 , pp. 493 - 497
Copyright
Copyright © 1979 by the Weed Science Society of America 

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References

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