PROBLEM TO BE SOLVED: To provide a direct planting machine that can work on dry rice field direct planting even one day earlier after rain fall.SOLUTION: A direct planting machine is characterized in that: a grooving device E is installed in a machine body B towed by a tractor T； the grooving device E is configured such that a large number of grooving rings W are attached to a drive shaft 63 at regular intervals along a direction Q perpendicular to a traveling direction P of the machine body B, and a seeding groove forming auxiliary device Fis mounted at one side or both sides of the grooving rings W disposed in a recess H formed by a pair of rear wheels BW of the tractor T； the device Fcomprises a ridging plate 1 for filling the recess H using soil S obtained by excavating the soil at one end in the width direction of the recess H, and a soil forming plate 2 continuously provided behind the ridging plate 1； and a seeding groove Vk is formed on a portion of the soil S by making a state of momentarily confining the soil S between a regulation flange ring body 86 of the grooving ring W and a grooving projecting plate part 90.【課題】降雨後においては、１日でも早く乾田直播作業を行える直播機の提供である。【解決手段】トラクタＴにより牽引される機体Ｂに作溝装置Ｅが装着され、当該作溝装置Ｅは、機体Ｂの進行方向Ｐと直交する方向Ｑに沿って一定間隔をおいて多数の作溝輪Ｗが駆動軸６３に取付けられ、前記トラクタＴの一対の後輪ＢＷにより形成される凹部Ｈに配置される作溝輪Ｗの一側方又は両側方に播種溝形成補助装置Ｆ1 が装着され、当該装置Ｆ1 は、前記凹部Ｈの幅方向の一端部の土壌を掘削した土Ｓにより前記凹部Ｈを埋める土寄せ板１と、当該土寄せ板１の後方に連続して設けられた土成形板２とから成り、前記土Ｓを、前記作溝輪Ｗの規制鍔リング体８６及び作溝突板部９０との間に瞬間的に閉じ込めた状態にすることで、当該土Ｓの部分に播種溝Ｖｋを形成する。【選択図】 図１１
