Technical Abstract: ABSTRACT In 2009 and 2010, three independent fertility trials were conducted on a putting green (PG) managed within the Pennsylvania State University Joseph Valentine Turfgrass Research Center (University Park, PA). The objective was to identify Penn A-1/A-4 creeping bentgrass putting green quality and growth response to rate, type, and/or timing of foliarly-applied nitrogen (N) fertilizer. Fertility treatments were prepared using a soluble ‘Amine’ 15–0–7 liquid fertilizer (13.7% stabilized-NH2, 1.3% NO3–N) containing 0.17% patented Speedo chemistry (Plant Impact Inc., Preston, UK), or a ‘Salt’ 15–0–7 liquid fertilizer (8.5% NO3–N, 6.5% NH4–N) formulated using KNO3 and NH4NO3. Amine or Salt fertilizer was applied to deliver 24.5, 37, or 49 kg N ha** –1 in 815 L ha** –1 spray volume. Two to five days per week following the first clipping yield collection, triplicate measures of 660– and 850–nm canopy reflectance were recorded after mowing. Reflectance data were used to calculate the normalized differential vegetative index (NDVI) and the dark green color index (DGCI), measures of turfgrass quality and density. In all three experiments, single application of Amine at N rate of 37 kg ha** -1 had similar (or even slightly higher) NDVI and DGCI as those treated with salt at higher N rate. The single application of 37 kg ha** -1 Amine had similar cumulative N uptake as the other treatments with higher N rates. In addition, since it had less N input than the other treatments with higher N rates, it also had better N use efficiency and thus may have less N loss.