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Detecting and Confirming Accelerated Atrazine Dissipation in Illinois

Published online by Cambridge University Press:  20 January 2017

Dale Shaner  and
Aaron Hager
Dale Shaner*
Affiliation:
United States Department of Agriculture, Agricultural Research Service, Water Management Research, 2150 Centre Avenue, Building D, Fort Collins, CO 80526
Aaron Hager
Affiliation:
Department of Crop Sciences, University of Illinois, 1102 South Goodwin Avenue, Urbana, IL 61801
*
Corresponding author's E-mail: dale.shaner@ars.usda.gov.
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Abstract

Enhanced dissipation of atrazine has been documented in many parts of the world where the herbicide has been extensively used. Atrazine is widely used in corn in Illinois, but enhanced dissipation in the field has not been documented. In this study, the dissipation of atrazine was measured in three fields. Two of the fields (URB-1 and URB-2) had not been treated with atrazine for 3 and 4 yr, respectively, whereas the third field (ORR-1) had received annual applications of atrazine for 9 yr. A laboratory assay conducted on soil collected from these fields prior to atrazine application indicated that soil from ORR-1 had enhanced atrazine dissipation (half life [DT50] 1.7 d). Soil from fields URB-1 and URB-2 dissipated atrazine much slower (DT50 was 13 and 11d, respectively). In the field, the rates of atrazine dissipation were similar to those measured in the laboratory. The DT50s were 2.4, 8.4, and 12.6 d for ORR-1, URB-2, and URB-1, respectively. Testing the soils collected from the fields at the last sampling time for atrazine dissipation showed that all of them had enhanced atrazine dissipation, suggesting that the soil microbial populations had adapted to the presence of atrazine in the field.

La disipación acelerada de atrazine ha sido documentada en muchas partes del mundo donde este herbicida ha sido usado en forma extensiva. En Illinois, atrazine se usa ampliamente en maíz, pero la disipación acelerada en campo, no ha sido documentada. En este estudio, se midió la disipación de atrazine en tres campos. Dos de los campos (URB-1 y URB-2) no habían sido tratados con atrazine en 3 y 4 años, respectivamente, mientras que el tercer campo (ORR-1) había recibido aplicaciones anuales de atrazine por 9 años. Un ensayo de laboratorio realizado con el suelo proveniente de estos campos colectado previamente a la aplicación de atrazine indicó que el suelo de ORR-1 tenía disipación acelerada de atrazine (vida media [DT50] 1.7 d). Los suelos provenientes de URB-1 y URB-2 disiparon atrazine más lentamente (DT50 fue 13 y 11 d, respectivamente). En el campo, las tasas de disipación de atrazine fueron similares a las medidas en el laboratorio. Las DT50s fueron 2.4, 8.4, y 12.6 d para ORR-1, URB-2, y URB-1, respectivamente. Al evaluar los suelos colectados en estos campos en el último momento de muestreo para determinar la disipación de atrazine, se mostró que todos estos campos tenían disipación acelerada de atrazine, lo que sugiere que las poblaciones microbianas se han adaptado a la presencia de atrazine en el campo.

Keywords

Atrazinecorn, Zea mays L.Enhanced dissipationherbicide dissipation
Type
Research Article
Information
Weed Technology , Volume 28 , Issue 2 , June 2014 , pp. 432 - 434
Copyright
Copyright © Weed Science Society of America 

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References

Literature Cited

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