Martyniuk, S. 2019. BIOLOGICAL FIXATION OF N2, SYMBIOTIC BACTERIA OF LEGUMES IN POLISH SOILS AND ESTIMATION OF THEIR NUMBERS. Polish Journal of Agronomy. 38, 38 (wrz. 2019), 52–65. DOI:https://doi.org/10.26114/pja.iung.390.2019.38.07.