As a rule land never depreciates. homes never depreciate unless left to ruin, mobile homes on the other hand depreciate like vehicles.
Farmland is land that is used to grow crops and/or raise livestock.
On farms....
Farmland, tillable acres, ground, acres are all terms that farmers use when talking about the land that they farm.
What not of them ? I think you need to be a little more direct in the question.
they used the nile to water it when it floods.