Photograph shows snow blown off of plowed field. A large deposit of dust due to wind erosion on snowdrift at right.

Stubble mulch - TNT - 3" top furrow slice - 4" sub-base slice followed by spring tooth harrow and threader (rotary hoe) pulled backwards.

TNT plow - Stubble mulch - 5" top furrow slice and 2" sub-base slice - followed by spring tooth harrow. Photographed just prior to planting.

Turn plow and disc harrow - conventional chisel cultivation. Check plot.

End view of plot plowed with TNT plow. 3" top furrow slice and 4" sub-base slice. Followed by spring tooth harrow two weeks later and compacted with rotary hoe operated backwards - rotary hoe cultivation.

Close-up of surface Plot 22 (1947) subsurface sweep plus disc. Note residual mulch is medium.

General view of Plot 22 (1947). Subsurface sweeps followed one week later by discing.

Close-up of clips (safety) holding flexible connector to delivery tube. Deep lime machine.

Stubble mulch - Plowed with pulverator plow (rotary moldboard) - 3" top furrow slice - 4" sub-base slice followed by spring tooth harrow two week later. Spring tooth harrow shown in photo.

Plot prepared by sub-surface sweeps to depth of 7" - followed by heavy discing - corn planter marks showing.