I'm way overpowered  for my crop acres,   I included  the combine  HP too..    I don't  pick by hand :)

So,   for the cropping  part I'm  almost  5 hp per acre  TOTAL.  (got an ol'   massey  4880  that  whips  through the fields  in short order.    I  yank  pairs off the   'calving pens'.  ( 4 irrigated  circles)    run them to  grass,     and  an hour later I'm   chiseling.  

When I   divide  those  numbers  out over  my hay ground,   I'm  barely over 1 hp/acre.