| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a working vehicle that can accurately form a desired ditch set by an operator in an agricultural field. <P>SOLUTION: A tractor detects a grounding position of a ditch digging machine and an agricultural field surface when forming the ditch in the agricultural field by an automatic control (S3). With the grounding position being the reference point, the ditch is accurately formed up to the set initial depth at the starting end part of the ditch by lowering the ditch digging machines, and the ditch is formed in the agricultural field with the predetermined inclination from the starting end part (S4). <P>COPYRIGHT: (C)2013,JPO&INPIT |
