Farmers using other controls methods must occasionally resort to chemical control for tough cases. However, even when chemical control is required, it’s possible to reduce the amounts of chemicals used.
Careful calibration or setting of the sprayer is essential to not over-apply chemicals.
In addition, many farmers use banding techniques that spray chemicals in a narrow band over the crop row and rely on cultivation for the weeds between rows. An Iowa State University research study shows that this method reduces the amount of chemicals used by 50 to 67 percent, while maintaining the corn yield on 99 percent of the fields tested.