PROBLEM TO BE SOLVED: To realize a farming machine equipped with an easily attachable/detachable tread pressure mitigating tool that can loosen solid soil compacted by a tread pressure of both right and left wheel tires of a tractor in a field right behind the tires, and that can improve water permeability from a surface of the field through a plow layer, a plow sole layer and a subsoil layer with enhanced water retentivity.SOLUTION: Right and left tread pressure mitigating tools 13 and 14 are detachably fixed and fitted to rear surfaces of subsoilers 28 and 32 arranged right behind both wheel tires of a tractor 2. An excavation blade 46 is attached to a lower end of each of the tread pressure mitigating tools 13 and 14, and subsoil of a subsoil layer in a belt-like portion in a field right behind both right and left wheel tires of the tractor 2 is crushed by the tread pressure mitigating tools 13 and 14 in order to improve water permeability and enhance water retentivity.COPYRIGHT: (C)2014,JPO&INPIT【課題】トラクタの左右両輪のタイヤの踏圧で固められたタイヤの直後方の圃場における固まりを緩和し、圃場の表面から作土層、耕盤層乃至心土層への透水性を改善し、保水性を高めることのできる簡単に着脱可能な踏圧緩和具を備えた農作業機を実現する。【解決手段】トラクタ2の両輪のタイヤの直後方に配置されたサブソイラ28、32の後面に、右側及び左側の踏圧緩和具13、14を着脱可能に固定して装着され、踏圧緩和具13、14の下端部には、掘削刃46が取り付けられており、踏圧緩和具13、14によって、トラクタ2の左右両輪のタイヤの直後方の圃場における帯状の部位における心土層の心土を破砕して、透水性を改善し、保水性を高める。【選択図】図4
