#crop__harvest  the yield from plants in a single growing season
  supertype:  #output__yield  production of a certain amount
  subtype:  #cash_crop  a readily salable crop that is grown and gathered for the market (as vegetables or cotton or tobacco)
  subtype:  #catch_crop__catchcrop  a quick-growing crop (e.g. lettuce) planted between two regular crops grown in successive seasons or between two rows of crops in the same season
  subtype:  #cover_crop__covercrop  crop planted to prevent soil erosion and provide green manure
  subtype:  #fruitage  the yield of fruit; "a tree highly recommended for its fruitage"
  subtype:  #root_crop  crop grown for its enlarged roots: e.g. beets; potatoes; turnips

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