It takes more bonemeal to fertilize (0.06->0.6) , but every bone gives more Bonemeal too (0.1->1.0). It's mostly a (well-deserved) nerf of Fish-skeletons (0.1->0.25).
Woodchips can now,
now=after server reset 14Dec, be used to lower your field upkeep to the "floor" : old field have a floor at 50%
(I'm sure of that) , new field :
no idea probably 50% but I didn't check it myself . According to
Carver with the new Plantation Management skill you should be able to lower the floor to 25% with an iron hoe , or 20% with the Farmer's hoe (store).
Bjebr