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Crop plants accumulated chromium from nutrient solutions labelled with either 51CrIII or 51CrVI and retained approximately 98 % of the elements in the roots. Of the 9 crop species examined, cauliflower plants accumulated the most chromium in both shoots and roots and mung bean seedlings the least. Species differences of approximately 10-fold in the tops and 5-fold in the roots were recorded. The roots of each species supplied with 51CrIII contained more chromium than those supplied with W r V I but the reverse was found in the shoots. There was a greater proportion of soluble chromium in plants supplied with 51CrVI than in those supplied with WrIII, the major soluble compound being tentatively identified as trioxalato-CrIII. Little chromium was associated with cell organelles or soluble proteins.

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