The land- or forestry-knife such as cutting knives for rotary mower, rotor knife, food mixer knives, straw chopper knife or stalk chopper knife, comprises a base body (2) having two main surfaces (3) and side surfaces (4), where the base body has an edge (5) in an area of the side surface, and steel layer extending itself parallel to the main surface of different hardness. A hard steel layer (11) has a thickness that is 30% larger than a thickness of the less hard steel layers. The hard and less hard steel layers are alternately arranged above one another respectively. The land- or forestry-knife such as cutting knives for rotary mower, rotor knife, food mixer knives, straw chopper knife or stalk chopper knife, comprises a base body (2) having two main surfaces (3) and side surfaces (4), where the base body has an edge (5) in an area of the side surface, and steel layer extending itself parallel to the main surface of different hardness. A hard steel layer (11) has a thickness that is 30% larger than a thickness of the less hard steel layers. The hard and less hard steel layers are alternately arranged above one another respectively. The two main surfaces are formed by the hard steel layer. The base body has six steel layers, which have a thickness of 0.08-1.0 mm. The base body has the steel layers having two different harnesses. The hard steel layers have a hardness of 580-800 HV, and the less hard steel layers have a hardness of 560 HV, where the hard steel layers have a carbon content of 0.30-1.20%, and less hard steel layers have a carbon content of 0.18%. The edge is formed in a roof-shaped manner, and the base body has a hard central steel layer, which has the hardness of 620-800 HV, and a thickness, which is 15-35% of the thickness of the base body. The base body is hardened and tempered in the area of its edge.
