A METHOD OF PLANTING A SEED, PLANT, BUSH OR TREE, AND A DRILL

摘要

The invention relates to a drill for realizing a partially tapered bore hole in a soil covering a hardpan layer. The drill comprises a rotatable drivable unit (2) that is provided with a carrying structure (3) and a multiple number of cutting elements (4) carried by the carrying structure. The multiple number of cutting elements are arranged along a line extending substantially radially and outwardly from a central axis (A) of the rotatable drivable unit. Further, lower ends (13a, 13b) of cutting elements in a radial inner section are mainly positioned in a plane (P) transversely to the rotation axis of the rotatable drivable unit. On the other hand, lower ends of cutting elements in a radial outer section are mainly positioned in a downwardly tapered surface (9) having a symmetry axis coinciding with the rotation axis of the rotatable drivable unit. The lower ends of the cutting elements may subscribe, during rotation, a truncated cone surface.