solid line left by adjacent leveler discs d 1 d 2 working in opposite directions is quickly broken down by the weather and the troughs 111 left by the chisel plows are filled with loosened soil indicated by solid line mounds 103 104 in fig6 the leveler discs are set to operate at an elevation dashed horizontal line 113 in fig6 slightly above the original soil level h by an inch or two staggering the discs fore and aft of each pair of leveler discs has the advantage of avoiding compacting the narrow band or ridge of soil left by the gap between the discs this staggered arrangement also has the advantage of reducing any tendency of residue or soil clumps to plug between the convex non working surfaces of a disc pair moreover it will be observed that the concave working surfaces of adjacent leveler discs such as the end disc of assembly 130 a and the left side disc of disc assembly 130 b are also offset or staggered along the direction of travel this further facilitates the passage and handling of residue if the working surfaces of adjacent discs were in lateral alignment each would be heaping residue on the other and this would decrease the ability of the implement to handle residue the disc leveler may be adjusted in height relative to the transverse support frame 14 it will be recalled that the chisel toolbar 15 is rigidly attached to the transverse frame 14 and is raised and lowered with the transverse support frame 14 as it is elevated.