# Lawn Bonitation Value as a Function of Glycine-Complexed Iron Formulation Application
## 4 Discussion  
In the experiment, it was observed that the foliar application of an iron fertilizer complexed with glycine (and its subsequent increase in dose) positively influenced the overall aspect of the lawns and their compactness. This consistency was obtained for all seasons, which is an interesting supplement to the research conducted by [PERSON] et al. [18], who \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Fe Dose**} & \multirow{2}{*}{**Year**} & \multicolumn{2}{c}{**Cu**} & **Mn** & **Zn** & **Fe** \\ \cline{3-6}  & & & \multicolumn{4}{c}{**mg\(\cdot\)kg\({}^{-1}\) d.m.**} \\ \hline \multirow{3}{*}{Control} & 2020 & 7.13 \(\pm\) 1.08 & 164 \(\pm\) 25.6 & 42.2 \(\pm\) 1.69 & 223 \(\pm\) 59.3 \\ \cline{2-6}  & 2021 & 7.53 \(\pm\) 1.74 & 119 \(\pm\) 87.3 & 38.0 \(\pm\) 2.45 & 252 \(\pm\) 59.0 \\ \cline{2-6}  & 2020–2021 & 7.33 a \(\pm\) 1.31 & 142 a \(\pm\) 62.7 & 40.1 a \(\pm\) 2.97 & 238 a \(\pm\) 55.2 \\ \hline \multirow{3}{*}{Variant I: 60 g} & 2020 & 8.17 \(\pm\) 0.57 & 169 \(\pm\) 22.3 & 44.0 \(\pm\) 1.81 & 234 \(\pm\) 57.4 \\ \cline{2-6}  & 2021 & 7.21 \(\pm\) 1.15 & 117\(\pm\) 84.0 & 37.6 \(\pm\) 4.07 & 264 \(\pm\) 92.9 \\ \cline{2-6}  & 2020–2021 & 7.69 a \(\pm\) 0.97 & 143 a \(\pm\) 62.0 & 40.8 a \(\pm\) 4.46 & 249 a \(\pm\) 71.1 \\ \hline \multirow{3}{*}{Variant II: 100 g} & 2020 & 8.07 \(\pm\) 0.36 & 194 \(\pm\) 3.95 & 47.5 \(\pm\) 3.02 & 253 \(\pm\) 21.8 \\ \cline{2-6}  & 2021 & 7.69 \(\pm\) 1.02 & 150 \(\pm\) 105 & 42.8 \(\pm\) 5.23 & 354 \(\pm\) 212 \\ \cline{2-6}  & 2020–2021 & 7.88 a \(\pm\) 0.71 & 172 a \(\pm\) 70.7 & 45.2 a \(\pm\) 4.63 & 303 a \(\pm\) 148 \\ \hline \multirow{3}{*}{Variant III: 140 g} & 2020 & 8.79 \(\pm\) 0.77 & 188 \(\pm\) 19.8 & 49.4 \(\pm\) 1.57 & 260 \(\pm\) 38.6 \\ \cline{2-6}  & 2021 & 7.76 \(\pm\) 0.55 & 146 \(\pm\) 101 & 41.4 \(\pm\) 4.40 & 312 \(\pm\) 172 \\ \cline{2-6}  & 2020–2021 & 8.28 a \(\pm\) 0.82 & 167 a \(\pm\) 69.2 & 45.4 a \(\pm\) 5.30 & 286 a \(\pm\) 115 \\ \hline \multicolumn{3}{c}{Standard Deviation} & 0.978 & 63.4 & 4.8 & 101 \\ \hline \multicolumn{3}{c}{Variation Coefficient, \%} & 12.5 & 40.6 & 11.2 & 37.5 \\ \hline \end{tabular} The same markings (a) mean no statistically significant changes (\(p\geq\) 0.05).  
\end{table} 
Table 6: Effect of Fe fertilization on the microelement content in plants. Figure 2: _Wum_ depending on season and fertilizer variant; the same markings (a–d) mean no statistically significant changes in the season (\(p\geq\) 0.05). noticed that the foliar application of iron fertilizer improved the quality of the turf in the first two days after the treatment. Previous studies have shown that using a biostimulator with a high content of biologically active amino acids (L-alpha) with the addition of micronutrients shows a similar relationship in shaping the visual features of lawns [19]. The research carried out in this experiment confirms that the complexation of micronutrients with amino acids (in this case, glycine) can significantly increase the quality of a lawn. The selection of the microelement also plays a unique role; iron, as an activator of the formation of chlorophyll and an essential component for specific proteins [20], significantly impacts the bonitation value of lawns. This was confirmed mainly in [PERSON] et al. 's [21] experiment, which noted an increase in turfs' visual quality after using a biostimulator with an increased iron content in plant tissues. The stark differences noted between the highest dose of biostimulator used and the control sample with respect to the visual features of turfs may indicate that chlorophyll biosynthesis occurred as a result of the application of the biostimulator and that the concentration of this compound in plants rapidly increased. As a result of this action, a better coloration of the lawn was noted because the high concentration of chlorophyll strongly correlates with a darker color of the turf [22; 23; 24].