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Literatur Führ F, Sauerbeck D (1967) The uptake of colloidal organic substances by plant roots as shown by experiments with 14C-labelled humus compounds. In: Isotopes in plant nutrition and physiology : proceedings of the Symposium on the Use of Isotopes in Plant Nutrition and Physiology / jointly organized by the International Atomic Energy Agency ... and held in Vienna, 5-9 September 1966. Vienna: IAEA, pp 317-328