Pre-plant and pre-emergence residual herbicide programs are key to managing glyphosate-resistant and other difficult weeds, says Kansas State University Extension.

The cost of soybean seed has increased more than 225% since the introduction of glyphosate resistant varieties in 1996. This increase in price has caused growers to reduce the rate of seeding in fields. However, the lower crop seeding rate can lead to a more open canopy for weeds and increased competition with the crop.

Regardless of whether you intend to plant a Roundup Ready, Liberty Link, or conventional corn variety this year, it's important to think about the type of weed management program you will utilize.