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Picloram Persistence in Semiarid Rangeland Soils and Water

Published online by Cambridge University Press:  12 June 2017

C. J. Scifres ,
R. R. Hahn ,
J. Diaz-Colon  and
M. G. Merkle
C. J. Scifres
Affiliation:
Agr. Res. Serv., U. S. Dep of Agr., Dep. of Range Science
R. R. Hahn
Affiliation:
Agr. Res. Serv., U. S. Dep of Agr., Dep. of Range Science
J. Diaz-Colon
Affiliation:
Agr. Res. Serv., U. S. Dep of Agr., Dep. of Range Science
M. G. Merkle
Affiliation:
Soil and Crop Sci. Dep., Texas A&M Univ., College Station, Texas 77843
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Abstract

Residues in soil, following application of 0.25 lb/A of 4-amino-3,5,6-trichloropicolinic acid (picloram) to semi-arid rangelands, usually were restricted to the top 12 inches for 60 days. Five ppb or less picloram were detected below 12 inches at 120 to 180 days after application; but picloram usually dissipated from the soil profile within a year. More picloram was detected 5 months after application at 6 to 18 inches deep at the lower ends of plots with 3% slopes than in plots with 0, 1, or 2% slopes. Runoff water from plots irrigated 10 days after treatment contained 17 ppb picloram. Irrigation or rainfall at 20, 30, or 45 days after picloram application resulted in less than 1 ppb picloram in runoff water. No more than 1 or 2 ppb picloram were detected after dilution of runoff water in large ponds.

Type
Research Article
Information
Weed Science , Volume 19 , Issue 4 , July 1971 , pp. 381 - 384
Copyright
Copyright © Weed Science Society of America 

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References

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