"Chris" wrote
Is it OK to bury cat droppings?
Would it be OK under apple trees or gooseberry bushes?

I can't see why not, had an allotment where a neighbour had dozens of cats
and we didn't have a problem. Bury it deep enough so you and others don't
accidentally handle it.
There are possible risks from faeces, horse manure is the biggest vector of
tetanus, but normal sensible hygiene is all that is required.
If you think about it, any risk can't be any worse than the daily cleaning
out of a litter tray.

--
Regards
Bob Hobden
W.of London. UK