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Analysis of Industry Standards
- Missouri Extension - baler types - 
I had thought about the old Allis Rotobalers - I had heard some were rigged to run off two-cylinder Wisconsin air-cooled engines, because, when they were introduced, there were still a lot of tractors in service with no PTO, just a flat-belt pulley. I have never seen a Rotobaler set up this way, only with PTO shaft drives. These made small round bales - you can find videos on You-Tube. Several old-timers have told me livestock greatly preferred the round bales to square bales - the hay didn't poke their mouths as much. There are also several small Italian brands of round balers, and a couple of "boutiquey" miniature square balers to make decorative hay bales. If you are just interested in using it as green manure, a hay chopper and forage wagon(s) would do the trick, I think.
So it's a hay picker-upper followed by a hammer mill? Add a sickle bar, and you have all in one step. The problem, though, is volume, no? Perhaps this is where a simple hyhdraulic ram could spit out compressed, untied bales. A baler would compact the straw perhaps 5 times or so, with hydraulics, perhaps many more times, to make picking up mulch very effective, perhaps on one single platform consisting of sickle-compactor-trailer. That could be good. Just a pull-behind for LifeTrac.
The anpil pay 2.0 project built a curious baler. It's supposedly: - hand operated - continuously fed (as opposed to per bale) - high density - appropriate technology
I've asked for design files, but not gotten them (yet?).
https://doi.org/10.1016/j.biosystemseng.2016.08.007 has quite a bit more info (WARNING: closed scientific journal).