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Atrazine dissipation and carryover from commercial and starch-encapsulated atrazine formulations

Published online by Cambridge University Press:  12 June 2017

Gordon D. Vail ,
Michael V. Hickman  and
Marvin M. Schreiber
Gordon D. Vail
Affiliation:
Zeneca Ag Products, Findlay, OH 45840
Michael V. Hickman
Affiliation:
U.S. Department of Agriculture, Agriculture Research Service, Washington, DC 20560
Marvin M. Schreiber
Affiliation:
Department of Botany and Plant Pathology, Purdue-University, West Lafayette, IN 47970
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Abstract

Field experiments were conducted in 1991, 1992, and 1993 to evaluate the dissipation and carryover potential of atrazine from starch-encapsulated (SE) and commercial formulations (CF). Formulation was not a significant factor in atrazine dissipation at any application rate. The dissipation time required to reach one-half of the original concentration (DT50) was measured for each formulation. The atrazine DT50 combined over all years (1991 to 1993) and rates (1.1 to 3.4 kg ai ha−1) was 7 wk for the CF, 10.3 wk for the SE large particles (0.85 to 1.4 mm), and 8.2 wk for the SE small (0.425 to 0.85 mm). Oat injury in the spring of 1992 from all rates of both SE formulations applied in 1991 was greater than that from the CF formulation. Increased oat injury from SE formulations was attributed to more atrazine present in the top 0 to 8 cm of soil compared to that for the CF. Despite significant oat injury from the 1991 application, no injury was observed on soybeans planted in 1992. Soybeans planted in 1993 and 1994 also showed no injury from the respective applications. These findings suggest that the potential for atrazine carryover from starch-encapsulated formulations was not greater than that from the commercial formulation.

Keywords

Atrazineoat, Avena sativa L. ‘Ogle’soybean, Glycine max (L.) Merr. ‘Resnik.’Crop rotationgranular herbicideparticle sizepercent encapsulationrainfallstarch encapsulation
Type
Soil, Air, and Water
Information
Weed Science , Volume 45 , Issue 6 , December 1997 , pp. 842 - 847
Copyright
Copyright © 1997 by the Weed Science Society of America 

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