## 3 Results  
The year was a random factor in our study (Equation (1)). Due to the variability of weather conditions in particular years of field experiments, which affected the operation of the tested factors, e.g., used catch crops and inoculations with bacteria belonging to PGPR, the result of soil microbiological activity for each year is presented separately. In order to investigate the influence of the catch crops alone as well as the catch crops together with the PGPR consortium on the microbiological condition of the soil, the total count of heterotrophic bacteria, actinobacteria and mold; the level of activity of dehydrogenases, acid phosphatase, and catalase; and the biological index of fertility were measured. The two-way analysis of variance (Equation (2)) revealed that the applied catch crops alone and the catch crops applied together with the PGPR as well as the date of the study (BBCH phase of barley growth) had a highly significant effect (\(\alpha\) = 0.001) on the counts of selected groups of soil microorganisms and the level of biochemical activity of soil under organically grown spring barley (Table 2). There were also statistically significant interactions between the applied catch crop and/or the catch crop with the applied bacterial consortium and the count of the groups of soil microorganisms at individual dates of analyses. \begin{table}
\begin{tabular}{c c c c} \hline
**Parameter** & **Term** & **Variant** & **Interaction** \\ \hline  & 2019 & & \\ \hline Total number of heterotrophic bacteria & 76.90 *** & 15.34 *** & 8.5 *** \\ The number of Actinobacteria & 47.47 *** & 47.19 *** & 17.85 *** \\ The number of molds & 2.31 & 3.67 ** & 2.55 * \\ DHA & 31.65 *** & 92.87 *** & 5.08 *** \\ PAC & 415.22 *** & 49.41 *** & 10.37 *** \\ CAT & 27.87 *** & 34.39 *** & 4.50 *** \\ BIF & 31.34 *** & 93.35 *** & 4.99 *** \\ \hline  & 2020 & & \\ \hline Total number of heterotrophic bacteria & 25.27 *** & 13.26 *** & 1.78 *** \\ The number of Actinobacteria & 196.02 *** & 12.15 *** & 5.18 * \\ The number of molds & 11.15 *** & 3.33 *** & 1.18 * \\ DHA & 0.58 * & 5.56 *** & 1.38 * \\ PAC & 1.63 * & 11.45 *** & 2.54 ** \\ CAT & 1.61 * & 13.79 *** & 3.00 ** \\ BIF & 0.61 * & 5.48 *** & 1.38 * \\ \hline \end{tabular}
\end{table} 
Table 2: The F test statistics and significance levels of the two-way ANOVA for the counts of selected groups of microorganisms and enzyme activity resulting from the applied catch crop and/or applied bacterial consortium and the date of test as differentiating factors. Although there were statistically significant differences, the values of the soil microbial activity parameters were averaged for individual dates of the analyses. As a result, it was possible to observe trends in the influence of the applied catch crops or catch crops with PGPR inoculants on the microbiological parameters in the organic cultivation of spring barley. The dynamics of variation in the total count of heterotrophic bacteria in the soil under spring barley cultivated between 2019 and 2021 are shown in Figure 1A. \begin{table}
\begin{tabular}{c c c c} \hline
**Parameter** & **Term** & **Variant** & **Interaction** \\ \hline  & 2021 & & \\ \hline Total number of heterotrophic bacteria & 88.162 *** & 18.28 *** & 18.26 *** \\ The number of Actinobacteria & 12.12 *** & 30.09 *** & 15.22 *** \\ The number of molds & 17.11 *** & 7.71 *** & 2.7 ** \\ DHA & 14.60 *** & 4.02 *** & 1.77 ** \\ PAC & 64.99 *** & 30.81 *** & 11.91 *** \\ CAT & 101.88 *** & 25.51 *** & 10.19 *** \\ BIF & 17.02 *** & 4.52 *** & 1.15 ** \\ \hline  & & & \\ \end{tabular}
\end{table} 
Table 2: _Cont._  
Figure 1: The number of selected groups of microorganisms in particular variants of the experiment.