Combination seeding, tilling and fertilizing implement

Claim 1

An opener assembly adapted for forward movement through the soil for depositing material in the soil, said assembly including: an opener body having transversely spaced side members and an upright material channel extending between the side members; a sweep having transversely extending wings and a notched portion located between the wings; said opener body including support means for slidably receiving the sweep with the notched portion of the sweep embracing the side members; securing means for removably fixing the sweep in a field-working position with respect to the opener body; an upright knife, and means removably mounting the knife on the opener body forwardly adjacent the sweep; wherein the sweep includes soil-lifting structure for lifting soil over the sweep and the material channel opens into the top of the sweep for depositing material below the soil lifted by the sweep, and wherein the knife includes a lowermost portion located below the sweep, and means for channeling material to the soil behind the lowermost portion; a plenum located above the sweep, the sweep defining the bottom of the plenum; and wherein the sweep includes a transversely extending web portion, and said plenum is located above the web portion, and a centrally located tab extending upwardly behind the plenum, said securing means including means for releasably connecting the tab to the opener body.