Virginia Tech, Extension Service2019-06-242019-06-241945-03-09http://hdl.handle.net/10919/90518Sub-surface tilled vs. Disc of mixed clover sod for preparation for barley. Note darker color of sub-surface area4 x 5 inchesimage/jpegIn CopyrightApplied ScienceAgricultureVirginia Extension - Project 10Soil and Water ConservationErosion ControlTillagePhotographBiological Systems Engineering, Virginia Tech