Roundup Ready Corn is a genetically engineered corn resistant to Roundup weed control products. Monsanto developed the corn and manufactures Roundup herbicide. The system requires two applications of herbicides to kill the weeds. One application is just after planting, while waiting for the plants to emerge, and the other is later in the season. In addition, proper performance of the system requires that the field is tilled or burned to clean it of weeds before planting. This is referred to as "starting clean."
The Roundup Ready Corn system begins weed control at or before planting and continues through the entire planting season. This stops weed establishment while waiting for the corn to emerge. Stopping weeds from the beginning keeps weed seeds out of your crops and reduces the number of weeds that will emerge later in the season.
Roundup Ready Corn increases crop safety. By controlling the weeds early and throughout the entire season, the likelihood of losing the crop is reduced. Fewer weeds mean fewer problems with the crop, because weeds compete with the crop for resources. Increased crop safety results in an increased yield over several years.
Without Roundup Ready Corn, weed killer must be applied by the time weeds reach 4 inches tall. Otherwise, they will not be controlled. But sometimes the weather makes it impossible to apply weed killer on time. Roundup Ready Corn enables the farmer to start with weed killer from the beginning, and since there are fewer weeds to begin with, subsequent applications of weed killing products can wait until weeds reach 20 inches high if necessary.