PROBLEM TO BE SOLVED: To provide a method for tilling the field into a flat shape in normal rotation and tilling the field to form a large ridge in reverse rotation in tilling with a rotary tiller having a simplified configuration.SOLUTION: The rotary tiller (17) is provided with rotary shafts (41) protruding both right and left side of the lower part of a transmission case (40), a changeover operation part for changing over the shaft (41) to normal rotation or reverse rotation, and a tilling claw (54) for normal and reverse rotation attached on the rotary shaft (41) or a connecting shaft (51, 51) integrally connecting with the rotary shaft (41), wherein the method for rotary tilling selects the normal tilling or ridge forming by changing over the rotation of the rotary shaft (41) to normal or reverse rotation.COPYRIGHT: (C)2010,JPO&INPIT【課題】ロータリ耕耘装置において、構成を簡単化しながら、正転耕耘で平面状に耕耘し、逆転耕耘で大きな畦を形成する。【解決手段】ロータリ耕耘装置(17)の伝動ケース(40)の下部左右両側にロータリ軸(41)を突出し該軸(41)を正回転又は逆回転に切り換える切換操作部を備え、上記ロータリ軸(41)又は該ロータリ軸(41)と一体的に連結する連結軸(51,51)に正逆用耕耘爪(54)を取付け、ロータリ軸(41)の正転、逆転の切り換えによって普通耕耘か畝立作業かを選択するロータリ耕耘方法とする。【選択図】 図2
