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Metolachlor and Alachlor Persistence in Rice (Oryza sativa) Following Soybean (Glycine max)

Published online by Cambridge University Press:  12 June 2017

James L. Griffin  and
John F. Robinson
James L. Griffin
Affiliation:
Dep. Plant Pathol. Crop Physiol., 302 Life Sci. Bldg., Baton Rouge, LA 70803
John F. Robinson
Affiliation:
USDA-ARS, P.O. Box 1429, Crowley, LA 70527-1429
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Abstract

Field studies were conducted for 3 yr to evaluate the persistence of metolachlor and alachlor applied to ‘Centennial’ soybean and to determine their residual effect on ‘Mars' rice. At labeled use rates of metolachlor at 2.8 kg ai/ha and alachlor at 3.9 kg ai/ha, soil residue levels in the fall 5 months after application on Crowley and Midland silt loam soils averaged 0.04 and 0.05 ppmw, respectively. Metolachlor fall soil residues averaged 3.5 times higher when applied at 5.6 and 11.2 kg/ha compared to 2.8 kg/ha, but residues for labeled and double rates of alachlor were similar. In the spring 9 months after herbicide application, soil residues averaged over years did not exceed 0.06 ppmw. The 3-yr rice yields were not affected by residual metolachlor or alachlor.

Keywords

Alachlor, 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamidemetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamiderice, Oryza sativa L.soybean, Glycine max (L.)Merr.Crowley silt loam, Typic AlbaqualfMidland silt loam, Typic OchraqualfHerbicide residueherbicide carry overcrop rotationsoil incorporation
Type
Research
Information
Weed Technology , Volume 3 , Issue 1 , March 1989 , pp. 82 - 85
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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