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Controlled Release Starch Granule Formulations Reduce Herbicide Leaching in Soil Columns

Published online by Cambridge University Press:  12 June 2017

Rick A. Boydston
Rick A. Boydston*
Affiliation:
Agric. Res. Serv., U.S. Dep. Agric., Irrigated Agric. Res. and Ext. Cent., Prosser, WA 99350
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Abstract

Experimental controlled release starch granules (CRSG) containing 5.3% a.i. (w/w) norflurazon or 6% a.i. (w/w) simazine retarded the leaching of both herbicides in loamy sand soil columns when compared to commercial formulations of norflurazon [80% (w/w) dry flowable] or simazine [90% (w/w) water dispersible granule]. Barley bioassays indicated norflurazon and simazine remained in the surface 0 to 2.5 cm of soil when applied as CRSG formulations and moved to a depth of 15 cm when applied as commercial dry formulations and leached with 6 cm of water. CRSG placed on pre-wetted soil columns began to release norflurazon by 7 d at 25 C or 14 d at 15 C, and subsequent leaching moved norflurazon beyond the top 2.5 cm of the soil column.

Keywords

Norflurazon, 4-chloro-5-(methylamino)-2-(3-trifluoromethyl)phenyl)-3(2H)-pyridazinonesimazine, (6-chloro-N,N-diethyl-1,3,5-triazine-2,4-diamine)barley, Hordeum vulgare L.Encapsulationslow releaseherbicidesgroundwater quality
Type
Research
Information
Weed Technology , Volume 6 , Issue 2 , June 1992 , pp. 317 - 321
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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