Table 17. Percentage of residue conserved after each operation with different types of tillage machinery1
Type of equipment
Percentage of Residue conserved after each operation.
Blade or sweeps wider than 24" 90
Heavy-duty cultivator with sweeps 16-22" wide 85
Duckfoot cultivator with sweeps 9-14" wide 80
Rod weeder
with shovel attachment
90
80
Chisel
fall operation
85
70
One-way disk 50*
Flexible disk harrow 75*
* This number is an average; variation occurs depending on angle of cut, depth, and speed.

1From SCS Standards and specifications for soil conservation practices.