Phytotoxicity and leaf burn are synonymous for the unsightly leaf tissue desiccation that can occur following foliar applications of pesticides, plant growth regulators, and fertilizers. On turfgrass, phytotoxic damage is generally not permanent but can reduce the aesthetic quality of golf course putting greens. It has been inferred that both environmental and cultural influences are responsible for fertilizer induced phytotoxicity. The objective of this study was to determine the principle components responsible for phytotoxic damage and to develop a predictive model for phytotoxic potential. This research was conducted at the Valentine Turfgrass Research Center, University Park, PA on Penn G-2 and Penn A-4 creeping bentgrass (Agrostis palustris L.) greens. Randomized complete block designs were used to evaluate ammonium nitrate (NH₄NO₃), ammonium sulfate (NH₄)₂SO₄, or urea (NH₂)₂CO applied at N rates of 9.8, 19.5, or 29.3 kg ha^-1. Treatments were applied at carrier volumes of 407.5 or 815 L ha^-1 using a CO₂-powered backpack sprayer. Weather data was collected onsite every 4 minutes. Digital images and reflectance data (Fieldscout TCM 500) were collected prior to applications and 1.5 hours after treatment (HAT). Several environmental and cultural factors were found to increase phytotoxicity. Increasing air temperatures to 24˚C, a level satisfactory for creeping bentgrass growth, alleviated the phytotoxic severity; but air temperatures beyond that were detrimental. Increasing the relative humidity assuaged the phytotoxic damage. Increasing soil moisture to 0.22 θg lessened phytotoxicity, however overly saturated conditions increased damage. Elevated electrical conductivity values associated with ammonium nitrate or ammonium sulfate spray solutions exacerbated the phytotoxic potential. When air temperatures exceeded 24˚C and relative humidity levels were low, high rates of foliar N fertilizer (>19.5 kg ha^-1) applied to putting greens at low volumes showed greater likelihood of phytotoxic response.