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SW: spelt wheat, 1: ‘Badenstern’, 2: ‘Badenkrone’, 3: ‘Zollernspelz’; CW: common wheat ‘Dakotana’. AUTOCLAVED SOIL: control—sterile soil; FIELD SOIL: nonsterile soil, collected from Złotniki Research Station with a natural microbiological component; SOIL + AMF: autoclaved soil with the addition of arbuscular mycorrhizal fungi: DAOM 197198 strain of Rhizophagus irregularis.
