The optimum application time for preemergence herbicides is dependent upon a grower's management skills, environmental conditions, and properties of the herbicide used. In an ideal situation, all herbicides would be applied at the optimum time for performance. However, due to time constraints at planting, many applications are made for convenience reasons rather than for performance.
Iowa State University
Hartzler, Robert G. and Pringnitz, Brent A., "Application timing for preemergence herbicides" (1999). Integrated Crop Management News. 2191.
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