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Imazethapyr bioactivity and movement in soil

Published online by Cambridge University Press:  12 June 2017

Scott W. Jourdan ,
Bradley A. Majek  and
Albert O. Ayeni
Scott W. Jourdan
Affiliation:
Rutgers Agricultural Research and Extension Center, Rutgers University, Bridgeton, NJ 08302
Bradley A. Majek
Affiliation:
Rutgers Agricultural Research and Extension Center, Rutgers University, Bridgeton, NJ 08302
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Abstract

A bioassay using red beet root length indicated an increase in imazethapyr bioactivity in Berryland sand (BLS) as soil pH increased from 3.7 to 6.5. Increasing pH above 6.5 had no effect on imazethapyr bioactivity. The lowest imazethapyr concentrations detected by the bioassay at pH 6.5 were 0.5, 1, 2.5, and 5 to 10 μg kg−1 in acidwashed quartz sand, BLS, Aura loamy sand, and muck soil, respectively. After application of 0.07 kg ae ha−1 with 12.5 mm of simulated rainfall at 3-d intervals, imazethapyr remained in the 0 to 15 cm soil in BLS soil columns. Under this rainfall regime, the herbicide moved 30 cm deep 5 mo after application, but residues decreased significantly in surface soil. Imazethapyr bioactivity was highest and mobility was lowest at low soil temperature (10 C) and low moisture (4 to 6% w/w). Imazethapyr movement was monitored successfully using the red beet root length bioassay, and an herbicide residue map was developed to show the pattern of imazethapyr bioactivity in soil columns.

Keywords

Red beet, Beta vulgaris L. ‘Asgrow Wonder.'Herbicide residue mapherbicide persistencepetri dish bioassaysoil columns
Type
Soil, Air, and Water
Information
Weed Science , Volume 46 , Issue 5 , October 1998 , pp. 608 - 613
Copyright
Copyright © 1998 by the Weed Science Society of America 

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Footnotes

Current address of S. W. Jourdan: 301 Parkview Way, Newtown, PA 18940

Nigerian address: Department of Agronomy, University of Ibadan, Ibadan, Nigeria

References

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