In the spring, the residue is chopped, if necessary. Till or ridge planters usually have a sweep or double disk mounted in front of each planting unit. These sweeps or disks, set to operate 1-2 inches deep, transfer the disturbed soil and residue to the area between the rows. This leaves a clean strip into which the crop is planted. With the till-plant system, preemergence herbicides are often banded or broadcast after planting.
Several alternatives are available for applying fertilizers.
This is a system whereby seed is planted in previously undisturbed soil. A no-till planter is designed and equipped to plant through residue and into firm soil. Preemergence herbicides are usually applied after planting, with contact herbicides applied, if necessary, before the crop emerges to kill growing weeds.