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Persistence of Picloram Activity in Soil

Published online by Cambridge University Press:  12 June 2017

C. H. Keys  and
H. A. Friesen
C. H. Keys
Affiliation:
Experimental Farm, Canada Agriculture, Scott, Saskatchewan
H. A. Friesen
Affiliation:
Soils and Crop Section, Research Station, Canada Agriculture, Lacombe, Alberta
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Abstract

The persistence of 4-amino-3,5,6-trichloropicolinic acid (picloram) in soil was measured after varying periods of time up to 3 years with bioassay technique using sunflowers (Helianthus annuus L., var. Advent) as the indicator plant. Rates of application ranged from 0.5 to 48 oz/A on two soil types at Scott, Saskatchewan and two at Lacombe, Alberta. After 1 year, recovery ranged from 20 to 30% of the original application in the 0 to 9-inch depth in each soil not disturbed by tillage directly after application. Recovery of the herbicide applied at rates of 8 oz/A or higher in the fall declined to about 10% after 24 months and to 6% or less after 35 months for even the highest rates. Picloram activity generally was concentrated in the surface 6 inches, indicating limited downward movement due to water in each of the soils. However, there was a tendency toward greater downward movement in the soils having lower organic matter content.

Type
Research Article
Information
Weed Science , Volume 16 , Issue 3 , July 1968 , pp. 341 - 343
Copyright
Copyright © Weed Science Society of America 

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References

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