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ARS Home » Midwest Area » St. Paul, Minnesota » Soil and Water Management Research » Research » Publications at this Location » Publication #377592

Research Project: Developing Agricultural Practices to Protect Water Quality and Conserve Water and Soil Resources in the Upper Midwest United States

Location: Soil and Water Management Research

Title: Sorption and desorption of bicyclopyrone on soils

item Spokas, Kurt
item Schneider, Sharon
item GAMIZ, BEATRIZ - Instituto De Recursos Naturales Y Agrobiologia De Sevilla (IRNAS-CSIC)
item HALL, KATHLEEN - Minnesota Department Of Agriculture
item CHEN, WENLIN - Syngenta

Submitted to: Agricultural and Environmental Letters
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 12/10/2020
Publication Date: 2/4/2021
Citation: Spokas, K.A., Schneider, S.K., Gamiz, B., Hall, K., Chen, W. 2021. Sorption and desorption of bicyclopyrone on soils. Agricultural and Environmental Letters. 5(1). Article e20039.

Interpretive Summary: Bicyclopyrone is a new herbicide that targets a specific enzyme reaction in plants and is particularly used for control of weeds that have become resistant to other herbicides. However, there is little known about the behavior of bicyclopyrone in the soil system. Therefore, this study evaluated its sorption across a wide collection of soils (25 total), that ranged in chemical properties. Our data demonstrated that there was no correlation observed between any of the soil properties measured (including organic matter) and the observed sorption capacity of the soil. This lack of correlation with soil properties complicates prediction of risk of carryover and water contamination by bicyclopyrone. These results are significant to assist scientists, engineers, farmers, as well as supplying guidance to better predict the conditions that present an increased risk of environmental contamination by bicyclopyrone.

Technical Abstract: Bicyclopyrone is a new herbicide that is targeted for the control of herbicide resistant weeds. However, there is a lack of data on its sorption and factors that control its sorption in the soil system. In this study, we evaluated a series of 25 different soils, with a variety of soil properties to assess if an empirical relationship could be developed to predict the sorption coefficient for bicyclopyrone. Overall, there were no statistically significant relationships observed with organic carbon, cation exchange capacity, or clay content. There solely was a moderate negative correlation with soil pH (R=-0.65). Additionally, Freundlich isotherm analysis suggests that the KD could be adequate to characterize the sorption behavior for the range of soils evaluated here.