sweettractors
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What I was thinking was dig the trench with something like that, then installing the pipe - not at the same time. I would guess it would take several passes to get the depth and maybe a little wider with each pass. That may beat renting a ditch witch!
You can get deeper with each pass, however, I doubt it will get any wider. It will just follow the same slot. A little manual Labor would go along way with the subsoiler. Ken Sweet