Back view of deep lime placement machine. Note feed control clutch at right; feed adjustment handle at right center. Flexible connection between outlet and subsurface delivery tube.

Close-up of residue on Plot 9 (1947). Roto Tiller plot. Note exposure of roots and separation of soil from root mass.

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

Details of winch type depth control - depth scale on upright allows quick chuck.

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

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

Side view of pulverator plow in action. Note forward or right hand rotary operating free due to removal of upper base.

Stubble mulch - Plot prepared by TNT plow. 3" top furrow slice. 4" sub-base slice spring tooth harrow. Two week later - planter marks showing.

Front view of deep lime placement machine. Depth control winch in foreground. Note hitch maintained directly through beam.

General view of experimental deep lime placement machine in operation. Subsoil beam at 12 inch depth. This is initial trial upon which were based later modifications.