Legumes, including soybeans, are essential for sustainable agriculture. From the perspective of sustainability, this research has been planned with the main purposes of exploring food supply potential, researching alternative production systems, and determining food product quality. A field trial was carried out with three replications in two years (2017, 2018) to investigate the effect of two sowing dates (July 1st, July 15th) as second cropping of five soybean varieties (Arısoy, Ataem, Derby, Safir, S-312) grown as a second crop. Changes in the mineral composition and their relationships were investigated. The results revealed that the sowing date had a statistically significant effect on Fe, Ni, Mo and Mn. The second sowing date (July 15th) increased the content of Ca, Fe, Cu Mn, Ni, Mo while decreasing the Zn and B content. A soybean variety as a factor had a statistically significant effect on the elemental composition of all the investigated minerals except Fe. Changes in the soybean seed mineral content as a result of late sowing are highlighted in this paper. The content of Ca increased in the Ataem and Derby varieties. Zn increased in the Ataem variety. Fe increased in the Ataem, Derby, Safir and S-312 varieties. Ni increased in all the varieties. Cu increased in the Arısoy, Ataem, Derby and Safir varieties. Mo and Mn increased in all the varieties. B increased in the Ataem and S-312 varieties. Interaction of Sowing time x Variety was statistically significant (p

27.3.2022