Atrazine requires at least 1 inch of rain to move it into the root zone. Volunteer wheat may be a problem if it is sprayed after sweep plowing and insufficient rain occurs to activate the atrazine. Care should be taken to reduce unnecessary wheel tracks. AAtrex, especially if there is not enough rainfall to move the atrazine into the root zone. These fields should be watched closely and undercut with a sweep plow if grass begins to regrow.
Perennial weeds are more difficult to control with reduced tillage.
Banvel and 2,4-D will aid in the control of broadleaf perennial weeds. Timely application of Roundup is effective on most perennial weeds when properly applied. If sufficient snow is trapped and spring rain is received prior to corn or sorghum planting, they will plant these crops. Additional weed control is needed for corn and sorghum. If there is less than 3 feet of moist soil, they will fallow and plant winter wheat in the fall.