PROBLEM TO BE SOLVED: To provide a tillage tine with very excellent turning properties, while having vibration and horsepower consumption not so inferior to those of a conventional tillage tine.SOLUTION: The tillage tine having a base part 3 mounted on a tine shaft 2, a straight-blade part 4 extending from the base part 3 and a curved part 5 extending from the straight-blade part 4 is provided, wherein a curve from the straight-blade part 4 to the curved part 5 is curved in the direction opposite to the rotative direction A, and the curved part 5 is bent into a curved state from one lateral surface of the base part 3 to the side of the other lateral surface, and a blade part 6 is provided on the front side in the rotative direction A ranging from the straight-blade part 4 to the curved part 5. In the tillage tine, the tine height 8 which is a distance along the tine shaft 2 from the one lateral surface of the base part 3 to the front end part 11 in the curved direction of the curved part 5 is brought to be about 75 mm the front bending R9 which is the bending radius of the curved part 5 is brought to be about 80 mm and the cutting angle 10 which is an angle between a line E intersecting a line D connecting the front end part C of the blade edge 6a of the blade part 6 to the axis center O of the tine shaft at right angles and extending from the front end part C to the side opposite to the rotative direction A and a line F parallel to a bending starting line B of the curved part 5, and extending from the front end part C to the side of a peak 12 of the tillage tine is brought to be about 37° or about 40°.COPYRIGHT: (C)2010,JPO&INPIT【課題】反転性は非常に優れながら、振動・消費馬力は現行の耕耘爪から大きく劣らない耕耘爪を提供する。【解決手段】 爪軸2に取付ける基部3と、基部3から延びる直刃部4と、直刃部4から延びる湾曲部5とを有し、直刃部4から湾曲部5にかけて回転方向Aと逆向きに湾曲され、湾曲部5は基部3の一側面から他側面側へと湾曲状に曲げられ、直刃部4から湾曲部5にかけて回転方向A前側に刃部6を有する耕耘爪において、基部3の前記一側面から湾曲部5の湾曲方向先端部11までの爪軸2に沿った距離である爪高さ8を略75mm、湾曲部5の曲げ半径である先曲げR9を略80mm、刃部6の刃縁6aの先端部Cと爪軸軸芯Oとを結ぶ線Dに直交し且つ先端部Cから回転方向Aと逆側に延びる線Eと、湾曲部5の折れ曲がり開
