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Effect of Soil PH on Fluridone Activity and Persistence as Determined by Chlorophyll Measurements

Published online by Cambridge University Press:  12 June 2017

Patrick J. Shea  and
Jerome B. Weber
Patrick J. Shea
Affiliation:
Dep. Agron., Univ. of Nebraska, Lincoln, NE 68583
Jerome B. Weber
Affiliation:
Dep. Agron., Univ. of Nebraska, Lincoln, NE 68583
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Abstract

Residue levels of fluridone {1-methyl-3-phenyl-5-[3-(trifluoromethyl)phenyl]-4(1H)-pyridinone} in soil were determined indirectly by measuring the chlorophyll content of wheat (Triticum aestivum L.) grown on a Norfolk sandy loam (Typic paleudult; fine loam, siliceous, thermic) 14, 22, 39, and 66 days after a preemergence application of the herbicide. The half-life for 0.22 and 0.45 kg/ha of fluridone was estimated to be 18 days. Phytotoxicity increased with increasing pH in newly-treated soils and in soil sampled 14 days after treatment. Higher chlorophyll levels in wheat grown in soil sampled 39 days after fluridone application indicated a decrease in biologically-active herbicide. Soil removed from the field following later cultivation produced small reductions in chlorophyll at pH 4.0 and 5.2, but at pH 7.0 significant fluridone activity was still present in the soil after 66 days. Cultivation may have increased the surface concentration of the herbicide.

Keywords

Bioassayresidual activityhalf-life
Type
Research Article
Information
Weed Science , Volume 31 , Issue 3 , May 1983 , pp. 347 - 350
Copyright
Copyright © 1983 Weed Science Society of America 

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References

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