# Lawn Bonitation Value as a Function of Glycine-Complexed Iron Formulation Application
## 3 Results
Increasing the fertilizer dose to 140 g also affected the compactness of the lawns, allowing for scores of 8.53 \(\pm\) 0.31 and 8.77 \(\pm\) 0.21 for summer and autumn, respectively. \begin{table}
\begin{tabular}{c c c c} \hline
**Parameter** & **Year (n)** & **Dose (t)** & **Interaction (n\(\cdot\)t)** \\ \hline Overall Aspect (Spring) & 0.0206 & 0.0000 & 0.9765 \\ \hline Overall Aspect (Summer) & 0.0101 & 0.0000 & 0.9732 \\ \hline Overall Aspect (Autumn) & 0.0356 & 0.0000 & 0.9545 \\ \hline Compactness (Spring) & 0.0225 & 0.0000 & 0.9954 \\ \hline Compactness (Summer) & 0.0094 & 0.0000 & 0.9868 \\ \hline Compactness (Autumn) & 0.0161 & 0.0000 & 0.9763 \\ \hline Overwintering & 0.0090 & 0.0000 & 0.9978 \\ \hline Leaf Color in Autumn & 0.0002 & 0.0000 & 0.9846 \\ \hline Leaf Structure (Fineness) & 0.0001 & 0.0000 & 0.9978 \\ \hline Susceptibility to diseases (Snow mold) & 0.0007 & 0.0000 & 0.2251 \\ \hline Susceptibility to diseases (Brown leaf spot) & 0.0022 & 0.0000 & 0.0194 \\ \hline Leaf Greenness Index (Spring) & 0.0000 & 0.0043 & 0.9980 \\ \hline Leaf Greenness Index (Summer) & 0.0000 & 0.0003 & 0.9862 \\ \hline Leaf Greenness Index (Autumn) & 0.0000 & 0.0053 & 0.9849 \\ \hline P & 0.8768 & 0.0228 & 0.8621 \\ \hline K & 0.0000 & 0.1675 & 0.8150 \\ \hline Na & 0.0017 & 0.5479 & 0.6096 \\ \hline Ca & 0.1417 & 0.6049 & 0.8681 \\ \hline Mg & 0.1806 & 0.2349 & 0.9825 \\ \hline Mn & 0.1188 & 0.8092 & 0.9994 \\ \hline Fe & 0.2583 & 0.7087 & 0.9367 \\ \hline Zn & 0.0005 & 0.0205 & 0.7489 \\ \hline Cu & 0.2438 & 0.4454 & 0.5822 \\ \hline \end{tabular}
\end{table} 
Table 1: Profitability value (\(p\)-value) for the parameters evaluated (results of two-way ANOVA). Table 3 shows the scores for the minor lawn properties depending on the fertilization variant. Five properties were evaluated: overwintering, the leaf color in autumn, leaf structure (ffineness), and susceptibility to diseases (snow mold and brown leaf spot). In the case of overwintering, it was observed that applying a higher dose of glycine-complexed iron fertilizer resulted in the better overwintering of the lawns. Variants II and III resulted in significantly better overwintering (7.40 \(\pm\) 0.25 and 7.92 \(\pm\) 0.24, respectively) compared to the control (6.93 \(\pm\) 0.23). The leaf-color-in-autumn parameter showed a similar upward trend. The result from the control sample (6.27 \(\pm\) 0.27) was significantly lower than for the fertilization variants used. For variants I, II, and III, the following values were obtained: 7.52 \(\pm\) 0.31, 7.73 \(\pm\) 0.34, and 8.05 \(\pm\) 0.36. In terms of the leaf structure (fineness), the highest results were obtained for fertilization variant III (7.32 \(\pm\) 0.31), which was significantly higher than the other variants. It is also worth emphasizing that only increasing the dose to 100 g (variant II) was statistically significant. Using glycine-complexed iron fertilizer resulted in a decrease in the susceptibility of the lawns to diseases. In the case of snow mold, changes in the ratings were observed with the increasing fertilizer dose. Although no statistically significant differences were observed between the variants (I: 8.57 \(\pm\) 0.35, II: 8.82 \(\pm\) 0.22, and III: 8.95 \(\pm\) 0.07), all variants showed significant differences from the control (7.85 \(\pm\) 0.36). Regarding brown leaf spots, the Fe fertilization in doses of 100 g and 140 g caused maximal resistance to this disease (9.00 \(\pm\) 0.00). Variant I also showed decreased susceptibility (8.37 \(\pm\) 0.36) compared to the control (7.85 \(\pm\) 0.36) but its value was significantly lower than variants II and III. Table 4 shows the effect of Fe fertilization on the leaf greenness index. The highest values of the parameter were observed in autumn and the lowest in spring. In all seasons, it was observed that an increase in the dose of iron fertilizer complexed with glycine caused different ratings in the leaf greenness index.