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Field dissipation of S-metolachlor in organic and mineral soils used for sugarcane production in Florida

Published online by Cambridge University Press:  14 November 2019

Jose V. Fernandez
Former Graduate Student, University of Florida, Agronomy Department, Gainesville, FL, USA
D. Calvin Odero*
Associate Professor, University of Florida, Everglades Research and Education Center, Belle Glade, FL, USA
Gregory E. MacDonald
Professor, University of Florida, Agronomy Department, Gainesville, FL, USA
Jason A. Ferrell
Professor, University of Florida, Center for Aquatic and Invasive Plants, Gainesville, FL, USA
Brent A. Sellers
Professor, University of Florida, Rangeland Cattle Research and Education Center, Ona, FL, USA
P. Christopher Wilson
Professor, University of Florida, Soil and Water Sciences Department, Gainesville, FL, USA
Author for correspondence: D. Calvin Odero, University of Florida, Everglades Research and Education Center, 3200 E Palm Beach Road, Belle Glade, FL33430. Email:


Dissipation of S-metolachlor, a soil-applied herbicide, on organic and mineral soils used for sugarcane production in Florida was evaluated using field studies in 2013 to 2016. S-metolachlor was applied PRE at 2,270 g ha−1 on organic and mineral soils with 75% and 1.6% organic matter, respectively. The rate of dissipation of S-metolachlor was rapid on mineral soils compared with organic soils. Dissipation of S-metolachlor on organic soils followed a negative linear trend resulting in half-lives (DT50) ranging from 50 to 126 d. S-metolachlor loss on organic soils was more rapid under high soil-moisture conditions than in corresponding low soil-moisture conditions. On mineral soils, dissipation of S-metolachlor followed an exponential decline. The DT50 of S-metolachlor on mineral soils ranged from 12 to 24 d. The short persistence of S-metolachlor on mineral soils was likely attributed to low organic matter content with limited adsorptive capability. The results indicate that organic matter content and soil moisture are important for persistence of S-metolachlor on organic and mineral soils used for sugarcane production in Florida.

Research Article
© Weed Science Society of America, 2019

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Associate Editor: Cammy Willett; University of Arkansas


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