For a number of good reasons, applying muck to fields is accepted as good / best practice - it deals with a 'waste' issue, it provides nutrients (N, but especially P&K), organic matter and is less acidifying than art/ferts (which are also very expensive).
However.......
I'm struggling, because we only have a 30hp compact tractor which is not man enough for the cheap old muck spreaders (the ones on ebay that go for £3-500) and any thing new costs a fortune - £1500-2500 plus VAT (with tiny, tiny capacity). I've done a fag packet calculation and reckon I could generate c 40 tonnes pa with my sheep and horses over winter. I read to produce max limit 250kg N / ha you need to apply 42t/ ha (that's 6kg N / tonne). I'm in a NVZ so 170kg is my max, plus I only needed 120kg ave this year, so you could say at 20t/ha I could apply muck to 2ha which leaves 5ha with nothing or applying at a much lower rate / topping up with art fertiliser again.
I'm struggling to justify buying an expensive piece of equipment which in effect will only do half a job (unless I buy in composted green waste, but then I already have a spinner and artfert would be easy to apply....). A contractor is out - all their gear is too heavy for our land unless its bone dry and we don't have a loader so they would need to supply two tractors - more expense. Has anyone solved this conundrum on a small scale? What are the old rear discharge (land driven/pto) spreaders like? Not that these are always desperately cheap either, plus there are the spare parts issue if they break.