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Adsorption and Deactivation of Norflurazon by Activated Charcoal

Published online by Cambridge University Press:  12 June 2017

Robert J. Lamoreaux ,
Virginia L. Corbin  and
Balraj S. Johl
Robert J. Lamoreaux
Affiliation:
Herbicide Res., Sandoz Crop Prot. Corp., Zoecon Res. Inst., Plant Sci. Res. Dep. P.O. Box KK, Gilroy, CA 95021–2348
Virginia L. Corbin
Affiliation:
Herbicide Res., Sandoz Crop Prot. Corp., Zoecon Res. Inst., Plant Sci. Res. Dep. P.O. Box KK, Gilroy, CA 95021–2348
Balraj S. Johl
Affiliation:
Herbicide Res., Sandoz Crop Prot. Corp., Zoecon Res. Inst., Plant Sci. Res. Dep. P.O. Box KK, Gilroy, CA 95021–2348
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Abstract

Laboratory and greenhouse experiments were conducted to determine if activated charcoal can remove norflurazon from water and from a sand matrix, thereby reducing its availability for plant uptake. A ratio of approximately 10:1 activated charcoal:norflurazon completely inactivated norflurazon in water. In a sand matrix, activated charcoal: norflurazon ratios of approximately 100:1 and 200 to 300:1 completely reduced norflurazon injury to cotton and to soybean and corn, respectively. The amount of activated charcoal required to remove norflurazon from soil was estimated from bioassay and regression analyses. The accuracy of this method to eliminate injury to cotton without reducing control of prickly sida and seedling johnsongrass was confirmed by bioassay using a sandy loam soil.

Keywords

Norflurazon, 4-chloro-5-(methylamino)-2-(3-(trifluoromethyl)phenyl)-3(2H)-pyridazinonecorn, Zea mays (L.)cotton, Gossypium hirsutum L. ‘Stoneville 825’soybean, Glycine max (L.)Merr.prickly sida, Sida spinosa (L.) #3 SIDSPjohnsongrass, Sorghum halepense (L.)Pers. # SORHADetoxificationphytotoxicitySIDSPSORHA
Type
Research
Information
Weed Technology , Volume 3 , Issue 2 , June 1989 , pp. 297 - 302
Copyright
Copyright © 1989 by the Weed Science Society of America 

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