In the growing season 2014, yield and chemical composition of soybean cv. Merlin was studied in three localities in western Poland. Seeds dressed with Hi Stick Soybean^TM inoculant (Saatbau^®) in Fix Fertig system were sown at the sowing density of 70 germinating seeds per 1 m². Agroclimatic conditions in the growing season of soybean in particular localities were highly diversified, mainly in the amount and distribution of rainfall. In the flowering stage (BBCH 69), soybean plants in Grodziec Śląski reached the highest weight. In further development stages, plants in Kołbacz had the highest weight of vegetative and generative parts (seeds and pod shells). In this locality, in the green maturity stage (BBCH 79) and full maturity stage (BBCH 89) soybean stand reached a biomass of approx. 5 Mg·ha^-1. Diversified production potential of soybean was determined by plant height which affected weight of a single plant. Higher plants had a greater number of pods and seeds. Correlation between pod length and its weight in the full maturity stage was moderate (R² = 0.52). Chemical composition of soybean seeds indicated significant diversification between localities. Seeds in Grodziec Śląski had a higher total protein content. Seed yield in soybean depended on agroclimatic conditions, thus in Kołbacz, Pawłowice, Grodziec Śląski it was: 2.65, 1.55, 2.55 Mg·ha^-1, respectively. The lowest level of yield in soybean in Pawłowice (central part of Poland) resulted from the occurrence of flooding stress in early growth stages and long-term (June – August) drought in the summer.

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