Does having Smallholder and Acreage when Sowing yield extra grain?
Acreage counts as two fields for Smallholder, so you will not get extra sowing unless it is your only field.

Source:


  Acreage, Bean Field, Lettuce Patch and Turnip Field count towards the indicated maximum of 2 fields, and you receive extra grain or vegetables on them because of the Smallholder. The Acreage counts as two fields.


It is worth noting that this is an "unofficial compendium", so it is not as definitive as an actual rulebook. But it has been compiled based on rulings from the designer, as well as discussions in the rules forums at boardgamegeek.com.