## 3 Results and Discussion  
### Fresh and Dry Matter Yields  
The achieved yield parameters are presented in Table 3. The highest average yield of green matter was recorded in the monoculture of FM (37.1 t/ha). The lowest average yield of green matter was recorded in the monoculture of WSC (29.9 t/ha), which is a similar value as mentioned by [PERSON] et al. [33]. The yields of dry matter were exactly the opposite: the highest average yield of dry matter was recorded in the WSC monoculture (9.5 t/ha), which is 30% more than the yield reported by [PERSON] et al. [33] in their two-year experiment. The lowest yield of dry matter was recorded in the FM monoculture (8.1 t/ha). No statistically significant differences were found between the DM yields of all three variants. The percentage of dry matter ranged, on average, from 20.75% (FM) to 32.35% (WSC)--Table A1.  
For the yield of dry matter in the FM + WSC mixed culture, the LER (land equivalent ratio) was defined as a parameter evaluating the advantages/disadvantages of growing the tested plants in a mixed culture compared with their cultivation as sole crops [34].  
The average value was LER = 1.05. Based on this value, it is possible to state [35] that growing FM and WSC in a mixed culture was, in terms of DM yield, more advantageous than their cultivation in monocultures. Within the compared stands, the mixed culture exhibited a higher biomass production and LER \(>1\). It is generally acknowledged that the growing of two or more crops on the same plot at the same time often brings higher yields than the growing of sole crops [36]. According to [PERSON] et al. [37], the detected LER value indicates a more efficient use of site conditions [35; 36; 37]. There is also a certain risk of competition between the individual crops, particularly if legumes are intercropped with maize [24]. Mixed cultures were demonstrated to have many potential advantages--the direct transfer of nitrogen from legumes to cereals or other components in the mixed culture increases productivity [38; 39]. They are used to control weeds, insect pests and diseases [40], as well as to control soil erosion [41; 42]. Growing crops in the system of mixed culture offers possibilities for improving the condition of soil environment. However, the total yield of crops can be problematic compared with monocultures [38; 39; 40; 41; 42]. In terms of  
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**No.**} & \multirow{2}{*}{**Variant**} & **Yield of Green** & **Sample Weight** & \multicolumn{2}{c}{**Sample Weight**} & \multirow{2}{*}{**Weight Loss**} & \multirow{2}{*}{**Yield of Dry**} & \multirow{2}{*}{**LER**} \\  & & **Matter** & & & & **60\({}^{\circ}\)C** & & \\ \cline{3-8}  & & **t/ha** & **kg** & **kg** & **\%** & **t/ha** & \\ \hline
1 & FM & 37.1 \(\pm\) 2.7 & 0.954 \(\pm\) 0.140 & 0.207 \(\pm\) 0.027 & 21.8 \(\pm\) 0.5 & 8.1 \(\pm\) 0.6 & - \\
2 & WSC & 29.9 \(\pm\) 2.1 & 0.741 \(\pm\) 0.187 & 0.235 \(\pm\) 0.061 & 31.6 \(\pm\) 0.4 & 9.5 \(\pm\) 0.8 & - \\
3 & FM + WSC & 32.8 \(\pm\) 3.7 & 0.834 \(\pm\) 0.148 & 0.234 \(\pm\) 0.040 & 28.1 \(\pm\) 0.3 & 9.2 \(\pm\) 0.9 & 1.05 \(\pm\) 0.14 \\ \hline \hline \end{tabular}
\end{table}
Table 3: Yield parameters of two monocultures and one mixed culture of FM and WSC. [PERSON], 2019.  
the performed experiment, the system of mixed culture did not reach yields as high as the WSC variant in which the monoculture of white sweet clover was grown.