Residues of supercrit. extn. of raspberry, strawberry, blackcurrant and linen seeds were satd. with Zn2+ ions by adsorption from aq. soln. of ZnSO4, analyzed for elemental compn. and used as new biocomponents of micronutrients in plant growing. Their applicability was studied in vivo germination tests on garden cress (Lepidium sativum) to det. the Zn transfer factors from substrate to the plant mass. The plant length was the highest in the case of raspberry seeds. No toxic effects were obsd.