The Collaborative International Dictionary of English v.0.48:

Plowland \Plow"land`\, Plougland \Ploug"land`\, n.
   1. Land that is plowed, or suitable for tillage.
      [1913 Webster]

   2. (O. Eng. Law) the quantity of land allotted for the work
      of one plow; a hide.
      [1913 Webster] Plowman

The Collaborative International Dictionary of English v.0.48:

Plowgate \Plow"gate`\, Ploughgate \Plough"gate`\, n.
   The Scotch equivalent of the English word plowland.
   [1913 Webster]

         Not having one plowgate of land.         --Sir W.
                                                  Scott.
   [1913 Webster] Plowhead

WordNet (r) 3.0 (2006):

plowland
    n 1: arable land that is worked by plowing and sowing and
         raising crops [syn: cultivated land, farmland,
         plowland, ploughland, tilled land, tillage,
         tilth]