Field experiments were conducted in 2011 and 2012 in Belle Glade, FL to evaluate the response of sweet corn and weed control to pyroxasulfone on high-organic-matter soils in the Everglades Agricultural Area (EAA) of southern Florida with the use of dose-response curves. Pyroxasulfone was applied PRE at 31.25, 62.5, 125, 250, 500, and 1,000 g ai ha~(-1) on soil with 80 organic matter. Dose-response curves based on a three-parameter log-logistic model were used to determine pyroxasulfone rate required to provide 90 control (ED_(90)) of spiny amaranth, common lambsquarters, and common purslane in sweet corn. The ED_(90) values for spiny amaranth, common lambsquarters, and common purslane control were 209, 215, and 194 g ha~(-1) of pyroxasulfone, respectively, at 21 d after treatment (DAT). At 42 DAT, the ED_(90) values for spiny amaranth, common lambsquarters, and common purslane control were 217, 271, and 234 g ha~(-1) of pyroxasulfone, respectively. Sweet corn yield increased with increasing rates of pyroxasulfone. An estimated 214 g ha~(-1) of pyroxasulfone was required to maintain sweet corn yield at 90 level of the weed-free yield. In addition, pyroxasulfone did not result in sweet corn injury. These results indicate that pyroxasulfone canprovide effective weed control in sweet corn on high-organic-matter soils of the EAA.
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