Authority XL (sulfentrazone) from FMC offers preemerge and burndown chemistries to control a broad spectrum of winter and summer annuals. FMS says studies have shown that, used in the fall, Authority XL tankmixed with Rage D-Tech and Roundup PowerMax herbicides provided almost 100% control of weeds, including chickweed, henbit, lambsquarters, marestail and pennycress. Spring application provides control of weeds such as common ragweed, giant ragweed, common lambsquarters, common colklebur and common waterhemp. A reduced rate of 3.2 to 5.0 oz./acre can be used as a foundation for burndown and residual weed control in Roundup Ready or LibertyLink soybean systems. For non-genetically modified soybeans and glyphosate-resistant weed populations, a full rate of Authority XL at 5.0 to 9.6 oz./acre is recommended.