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In this book, the biosorption process used to produce biological components of fertilizers was examined. For this purpose, the waste biomass obtained from the supercritical fluid extraction of oils from multiple berries'seeds was used. It was shown that post-extraction residues of black currant, raspberrys and strawberry seeds constitute a valuable material for agricultural purposes. Detailed characteristics of these materials were presented. Moreover, it was shown that berries'seeds are characterised by good biosorption properties. It was possible to increase the content of microelements essential for plants by applying the biosorption process. The utilitarian properties of enriched materials were tested in field experiments. Bioavailability of microelements from enriched post-extraction residues of the berries'seeds to plants was assessed and the biofortification of edible parts of plants with micronutrients from the new products was achieved.