Andrew Stewart wrote:
Another idea is to make a wheel hoe 'seed drill' dealy-o like the ones listed above, with a circular saw retrofitted to be the disc opener.
I would recommend a lower profile blade with a scale saw kind of tooth pattern.
If there is a lot of work to be done I would also recommend a BCS walking tractor. But I'm there biggest fan so take that advice with a pillar of salt - it's too much mechanization for some's taste. They do also produce a lawn edger, as well.
I hope this helps!
P.S. I think it goes with out saying that said saw is 'donated to the cause' (warranty voided, motor/bearings abused, mud slowly ruins electrical connections or plugs up exhaust, etc.)