highly significantp < 0.001
Correlation analysis using mean values of indicators for two environments showed highly significant ( p < 0.001) positive relationships between the content of microelements Fe/Mn (r2 = 0.69), Fe/Zn (r2 = 0.49), and Zn/Mn (r2 = 0.46), which suggests a feasibility of selecting genotypes for several elements at once.