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Development of a Laboratory Bioassay and Effect of Soil Properties on Sulfentrazone Phytotoxicity in Soil

Published online by Cambridge University Press:  20 January 2017

Anna M. Szmigielski*
Affiliation:
Soil Science Department, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada S7N 5A8
Jeff J. Schoenau
Affiliation:
Soil Science Department, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada S7N 5A8
Eric N. Johnson
Affiliation:
Agriculture and Agri-Food Canada, Research Farm, Scott, SK, Canada S0K 4A0
Frederick A. Holm
Affiliation:
Plant Sciences Department, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada S7N 5A8
Ken L. Sapsford
Affiliation:
Plant Sciences Department, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada S7N 5A8
Juxin Liu
Affiliation:
Department of Mathematics and Statistics, University of Saskatchewan, 106 Wiggins Road, Saskatoon, SK, Canada S7N 5E6
*
Corresponding author's E-mail: anna.szmigielski@usask.ca.

Abstract

Sulfentrazone is a phenyl triazolinone herbicide used for control of certain broadleaf and grass weed species. Sulfentrazone persists in soil and has residual activity beyond the season of application. A laboratory bioassay was developed for the detection of sulfentrazone in soil using root and shoot response of several crops. Shoot length inhibition of sugar beet was found to be the most sensitive and reproducible parameter for measurement of soil-incorporated sulfentrazone. The sugar beet bioassay was then used to examine the effect of soil properties on sulfentrazone phytotoxicity using 10 different Canadian prairie soils. Concentrations corresponding to 50% inhibition (I 50 values) were obtained from the dose–response curves constructed for the soils. Sulfentrazone phytotoxicity was strongly correlated to the percentage organic carbon (P = 0.01) and also to percentage clay content (P = 0.05), whereas correlation with soil pH was nonsignificant (P = 0.21). Because sulfentrazone phytotoxicity was found to be soil dependent, the efficacy of sulfentrazone for weed control and sulfentrazone potential carryover injury will vary with soil type in the Canadian prairies.

Type
Special Topics
Copyright
Copyright © Weed Science Society of America 

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References

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