I have just returned to this game post release, and it seems to me that a fair few crops are reduce field fertility by quite a bit more than they used to - Carrots and turnips, for instance, are up from -2% to -3% and flax is now at -5% - researching the Sustainable farming tech does not seem to have had any impact (or at least none that shows up anyway)
I assume that in the long run, I will be able to off set the ‘fertility deficit’ through composting - But is farming being harder on the field fertility just the new baseline?