arable

Short definition from Wiktionary

Adjective

1. 1
   Able to be plowed or tilled, capable of growing crops (traditionally contrasted with pasturable lands such as heaths).
2. 2
   Under cultivation (within any quinquennial period) for the production of crops sown and harvested within the same agricultural year (contrasted with permanently-cropped lands such as orchards).

Noun

1. 1
   Land that can be cropped (i.e., land that is arable); land that is being cropped (i.e., land that is in the cropping phase of a crop rotation, currently being cropped rather than used as pasture or fallow).