DICT.TW Dictionary Taiwan

 Catch crop. Any crop grown between the rows of another crop or intermediate between two crops in ordinary rotation in point of time. -- Catch-crop*ping, n.
    Radishes . . . are often grown as a catch crop with other vegetables.    --L. H. Bailey.
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 catch crop
      n : 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