Northern Research and Demonstration Farm
Roundup Ready (RR) crops provide growers greater flexibility in weed management due to the ability of glyphosate to control larger weeds than other herbicides. Although this is advantageous, it can lead to yield losses if the glyphosate application is delayed too long. Research was conducted to determine the role of preemergence herbicides(PRE) and postemergence glyphosate applications(POST) in protecting crop yields in Roundup Ready corn and soybean.
Iowa State University
Rueber, David and Hartzler, Robert G., "Time of Weed Control" (2008). Iowa State Research Farm Progress Reports. 768.