1. AN EROSION CONTROL SOIL WORKING MACHINE COMPRISING A SUPPORT FRAME, A FIRST TRANSVERSELY EXTENDING HOLLOW BALLAST RECEIVING CYLINDRICAL DRUM ROTATABLY MOUNTED ON SAID FRAME, CIRCULAR CUTTER BLADES FIXED TO SAID DRUM AT LONGITUDINALLY SPACED POINTS THEREALONG, SAID CIRCULAR CUTTER BLADES PROJECTING RADIALLY OUTWARD FROM SAID DRUM FOR MULCH EMBEDDING ENGAGEMENT WITH THE GROUND, A SECOND TRANSVERSELY EXTENDING HOLLOW BALLAST RECEIVING CYLINDRICAL DRUM, MEANS MOUNTING SAID SECOND DRUM ON SAID FRAME PARALLEL TO AND REARWARD OF THE FIRST DRUM, SAID SECOND DRUM BEING MOUNTED FOR ROTATION ABOUT ITS LONGITUDINAL AXIS, AND RELATIVELY SMOOTH SURFACED CIRCULAR PACKING MEANS SURROUNDING SAID SECOND DRUM ALONG SUBSTANTIALLY THE FULL LENGTH OF THE SECOND DRUM FOR MULCH PACKING ENGAGEMENT WITH THE GROUND, THE MEANS MOUNTING SAID SECOND DRUM ON SAID FRAME CONSISTING OF A PAIR OF ELONGATED ARMS HAVING THE FORWARD ENDS THEREOF PIVOTALLY FIXED TO THE OPPOSITE SIDES OF THE FRAME FOR SWINGING MOVEMENT IN PARALLEL VERTICAL PLANES, SAID ARMS PROJECTING REARWARD OF THE FRAME, SAID SECOND DRUM BEING ROTATABLY MOUNTED BETWEEN THE REAR ENDS OF SAID ARMS FOR VERTICAL MOVEMENT THEREWITH, AND MEANS ENGAGED BETWEEN AND FIXED TO THE ARMS AND THE FRAME FOR VERTICALLY SWINGING AND SELECTIVELY LOCKING SAID ARMS, AND THEREBY THE SECOND DRUM, INTO ANY ONE OF A PLURAITY OF PIVOTALLY ADJUSTED POSITIONS ABOUT THE PIVOTALLY MOUNTED FORWARD ENDS OF THE ARMS BETWEEN TWO EXTREME POSITIONS, ONE WHERE ONLY THE CUTTER BLADES ENGAGE THE GROUND AND THE SECOND WHERE ONLY THE PACKING MEANS ENGAGES THE GROUND.