Field studies conducted from 2005 to 2007 Sri Kansas compared the effects of KIH-485 and flufenacet to acetochlor and s-metolachlor applied PRE in grain sorghum. All treatments were combined with 1.12 kg/ha of atrazine for broadleaf weed control. KIH-485 and flufenacet, each at one time (I X) and two times (2 X) the labeled rates, controlled large crabgrass 55 to 76 in 2005 and 94 or more in 2006 and 2007. In 2005, all herbicides controlled shattercane less than 20, and only KIH-485 at the 2X rate controlled shattercane more than 70 in 2006 and 2007. Averaged over herbicides, green foxtail was controlled 98 in 2005, 77 in 2006, and 79 in 2007. Most herbicides controlled foxtail 86 or more when averaged over experiments, however, s-metolachlor at 1X, flufenacet at either rate, or atrazine alone did not Sorghum was not Stunted with KIH-485 or flufenacet in two of seven experiments. However, sorghum growth was reduced 23 to 54 with the 2X rates of KIH-485, flufenacet, or acetochlor in four experiments. Compared to the weed free control, sorghum stand establishment was reduced 18 with the 2X rate Of flufenacet at Colby in 2006. At Hays in 2005, stand reductions occurred with acetochlor or KIH-485 at the 2X rates and either rate Of flufenacet. Averaged over experiments, grain yields were reduced 9 and 10 with KIH-485 and flufenacet at the 2X rates, respectively. Where precipitation was greatest during the 2 wk following herbicide application, weed control was the best with these herbicides, but sorghum injury was also greatest.
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