PROBLEM TO BE SOLVED: To form a drainage ditch in a great depth and width relatively to the original ground surface, to ensure pressing of soil in the drainage ditch, to hardly cause collapse thereof, to sufficiently perform drainage from the drainage ditch, and to thereby improve drainage efficiency.SOLUTION: An apparatus S for forming the drainage ditch of a paddy working machine which is installed in the paddy working machine for burying buried objects related to crops in the soil of a paddy field, and forms the drainage ditch on the soil surface by traveling of the paddy working machine is composed by including: a base body 1 installed in the paddy working machine a first furrowing body 10 installed in the base body 1, and moved by the traveling of the paddy working machine to push aside the soil and form a base ditch on the soil surface and a second furrowing body 20 installed on the rear side in the traveling direction of the first furrowing body 10 of the base body 1 to further push aside the soil of the base ditch formed with the first furrowing body 10, and reshape the base ditch into the drainage ditch.COPYRIGHT: (C)2010,JPO&INPIT【課題】 排水溝を元の地面に対する深さを深く且つ幅広に形成できるようにするとともに、排水溝の土壌の押えを確実にして崩れにくくし、排水溝からの排水を十分に行なうことができるようにして排水効率の向上を図る。【解決手段】 水田の土壌に対して作物に係る埋設物を埋設する水田作業機に設けられ水田作業機の走行により土壌表面に排水溝を形成する水田作業機の排水溝形成装置Sにおいて、水田作業機に設けられるベース体1と、ベース体1に設けられ水田作業機の走行により移動させられて土壌を押しのけて土壌表面に下地溝を形成する第一作溝体10と、ベース体1の第一作溝体10より走行方向後側に設けられ第一作溝体10により形成された下地溝の土壌を更に押しのけて排水溝に整形する第二作溝体20とを備えて構成した。【選択図】図1
