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Inactivation of Simazine and Atrazine in the Field

Published online by Cambridge University Press:  12 June 2017

Ronald E. Talbert  and
O. Hale Fletchall
Ronald E. Talbert
Affiliation:
Field Crops, University of Missouri University of Arkansas, Fayetteville, Arkansas
O. Hale Fletchall
Affiliation:
University of Missouri, Columbia, Missouri
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Abstract

The toxicity of 2-chloro-4,6-bis(ethylamino)-s-triazine (simazine) and 2-chloro-4-ethylamino-6-isoproylamino-s-triazine (atrazine) to eight crops was determined. The crops in order of increasing tolerance to these herbicides were Southern Giant Curled mustard (Brassica juncea (L.) Coss.), Missouri 0-205 oats, Straight Eight cucumbers (Cucurbita sativa L.), Knox wheat, Clark soybeans, RS610 grain sorghum, GT-112 inbred corn, and F-6 inbred corn. Inactivation of simazine and atrazine applied at 2 lb/A on field plots, as determined by soybean and oat bioassay, was most rapid when the soil environment was favorable for the growth of microorganisms. Very little inactivation occurred between September, 1960, and June, 1961, following a May, 1960 application. One year after application, 0.16 lb/A of atrazine and 0.31 lb/A of simazine were detected, but neither was detected after 16 months.

Type
Research Article
Information
Weeds , Volume 12 , Issue 1 , January 1964 , pp. 33 - 37
Copyright
Copyright © 1964 Weed Science Society of America 

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References

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