| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem wherein a strong root can not be broken because a conventional rotary tiller which generally uses dirk-shaped blades when tilling soil, thus digs up the soil by sticking the blade to the soil and utilizing the rotary power. SOLUTION: This tillage blade can till the soil by rotating a helical blade having a diameter increasing in the rotation direction of the shaft of the rotary tiller, while thinly cutting the hard residual root of a strawberry, or the like by the rotary power. COPYRIGHT: (C)2004,JPO
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