## 2 Materials and Methods
\begin{table}
\begin{tabular}{c c c c} \hline \multicolumn{1}{c}{**Number (Year) of**} & \multirow{2}{*}{**Fertilizer \(N\) Rate, kg/ha**} & \multicolumn{2}{c}{**Fertilizer Source**} & \multirow{2}{*}{**Components and Additives**} \\ \cline{4-3} \multicolumn{1}{c}{**24 h Evaluations**} & & & (\%\(\times\)N\(\times\)P\({}_{2}\)O\({}_{5}\)–\(\times\)K\({}_{2}\)O)** & \\ \hline \multirow{6}{*}{1 (2019)} & \multirow{2}{*}{7.32} & Urea (46-0-0) & None \\ \cline{3-4}  & & Urea + UF RXN products & 180 g kg\({}^{-1}\) \\ \cline{3-4}  & & (30-0-0) \(\dagger\) & Methylene areas \\ \cline{3-4}  & & Urea + DCD +NBPT (46-0-0) & 21 g kg\({}^{-1}\) DCD \\ \cline{3-4}  & & Urea (46-0-0) & None \\ \cline{3-4}  & & Urea + UF RXN products & 180 g kg\({}^{-1}\) Methylene areas \\ \cline{3-4}  & & (0.2 lbs/M) & 180 g kg\({}^{-1}\) Methylene areas \\ \cline{3-4}  & & Urea + DCD + NBPT (46-0-0) & 21 g kg\({}^{-1}\) DCD \\ \cline{3-4}  & & 1 g kg\({}^{-1}\) NBPT \\ \hline \end{tabular} \(\dagger\) Nitamin 30 L, Koch Agronomic Services, Wichita, KS, USA; \(\ddagger\) UMAXX, Koch Agronomic Services, Wichita, KS, USA.  
\end{table} 
Table 1: Years, runs, fertilizer sources and rates, and fertilizer components and additives employed in the experimental trial. The adjacent sixteen plots were then moved while condensate was dispersed from the chambers, equipment, and tubing using compressed air. The second experimental run was then initiated on the sixteen adjacent plots by assigning and applying the same fertilizer treatments, exactly as described for 9 July above, in randomized complete block design. An NH\({}_{3}\)-collecting flux chamber was again immediately installed on each treated plot prior to treating any subsequent plot, field blanks were dispensed, and scrubbing flasks connected. The following day (11 July), gas scrubbing flask contents were collected from each plot in the order the foliar treatments were applied 24 h previous, and all volatilization-measurement equipment was removed from the putting green. A similar experiment was established on a unique area of the 'Penn G2' creeping bentgrass putting green in late May 2019. The primary differences between this experiment run and those described above were: larger plot size (1.83 \(\times\) 0.92 m), a lower urea-N fertilizer application rate (7.32 kg N/ha), and a proportionally lower (611 L ha\({}^{-1}\)) carrier volume. Likewise, these described N fertilizer applications were initiated 24 May and reapplied every 11 \(\pm\) 3 d.  
Following moving on 16 July, liquid \(N\)-fertil treatments (Table 1) were applied at a 7.32 kg N/ha rate to plots in the four blocks. A control plot in each block was identically treated with de-ionized H\({}_{2}\)O. Each plot treatment was followed immediately by installation of a closed, NH\({}_{3}\)-measuring flux-chamber (as described). Again, the experiment was complimented by three flux trapping-efficiency chambers. The only difference between these and those described of the first experiment run was that they employed a 5 mL aliquot of 0.117 M (NH\({}_{4}\))\({}_{2}\)SO\({}_{4}\) for NH\({}_{3}\)-generation. On 2 September, moved plots received identical applications of 7.32 kg N/ha fertilizer treatment, followed by a NH\({}_{3}\)-volatilization measurement campaign as described for 16 July. These two repeated measures comprised the third experiment run. Final 2019 treatments were applied 1 October and comprised 73.2 kg N (ha year)\({}^{-1}\) in total. Treatments resumed on the same plots 13 May 2020. Following moving on 8 and 29 June 2020, the 7.32 kg N/ha fertilizer treatments were reapplied as described and immediately followed by installation of a dedicated flux chamber. Ammonia emission was sampled for 24 h and data resulting from these two repeated measures comprised the fourth experiment run. The quotient of fertilizer-N volatilized (kg/ha) by fertilizer-N applied (kg/ha) equals percent fertilizer loss as NH\({}_{3}\)-N data and were combined for global analysis in PROC MIXED (SAS Institute, v. 9.4, Cary, NC, USA).