A pot experiment with soya bean, Warszawska cultivar, was established on specific brown soil. Soya bean was sprayed with solutions of auxins – IBA, NAA and their mixture IBA + NAA (each solution: the concentration of 20 mg·dm^–3), twice in the vegetation period, when exposed to fixed NPKMg fertilisation, against the control (distilled water spraying). Both auxins increased the seed weight; greater increases were due to IBA application, as compared with the control. IBA also enhanced the concentration of nitrogen in seeds by approximately 7%, hence a 46.2% increase in nitrogen uptake. Synthetic auxins favourably modified the distribution of nitrogen, phosphorus, potassium, sodium, calcium and magnesium in the above-ground soya bean organs, which intensified the removal of, especially, phosphorus and nitrogen from pod-shells, leaves and stems to seeds.

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