Virginia Tech, Extension Service2019-06-052019-06-051905-04-29http://hdl.handle.net/10919/89858Close-up of chisel sub base under rotary moldboard plow (pulverator). Sweep base shown at left.positive, 4 x 5 in.image/jpegCreative Commons Public Domain Mark 1.0Applied ScienceAgricultureVirginia Extension - Project 10TillageErosion ControlSoil and Water ConservationApplied ScienceAgricultureAgricultural EngineeringVirginia Extension - Project 10TillageErosion ControlSoil and Water ConservationPhotograph