A wavy disc and coulter with notches and method of using same, the disc or coulter having plurality of waves formed in the blade by deviating the entire outer periphery of the variable wave coulter from a flat plane. A plurality of crests and a plurality of valleys are formed in the blade, wherein each of said plurality of waves comprises a first and a second crest and one valley between the first and second crests at the outer periphery thereof. A notch is disposed in each respective wave on the outer periphery of the blade and wherein at least a majority of the notch is disposed between the first one of the respective crests and the respective valley, such majority of the notch being closer to the first respective crest than to the second respective crest.