Patent ID: 7290491

Claim:
Agricultural knife apparatus structured as to be suitable for inserting materials into the ground, wherein: the apparatus is structurally suitable for the operation of creating a slit-opening in the ground and of inserting the materials into the slit-opening, at a depth that is less than about 15 cm vertically below the ground surface; the apparatus includes a shank and a blade, and includes a transition zone, at which the shank and blade are joined integrally; the shank includes a front surface and a rear surface, and left and right side surfaces; when viewed in front elevation, the shank has an axis, termed the shank axis; the blade is formed with an over-surface and an under-surface, which intersect at a line, and the line defines an angled-knife-edge of the blade, and the angled-knife-edge of a blade portion is lowermost in the ground relative to the blade portion; the shank axis intersects the line of the angled-knife edge, at a point of intersection on the angled-knife-edge; when viewed in front elevation, the line of the angled-knife-edge slopes at an angle, termed the knife angle, relative to the shank axis, and the knife angle is between 30 and 60 degrees; the angled-knife edge has a bottom extremity thereof.