Temporal Recovery of Polymer-Coated Urea-N by Kentucky Bluegrass in the Field

Relative to soluble N sources, controlled release fertilizer (CRF) fosters consistent turfgrass growth response and improved canopy quality while reducing loss as nitrate, ammonia, and/or N2O from target systems. Commercial CRFs afford managers greater operational efficiency flexibility in nutrient management planning compel the investigation of application rate thresholds guide regional agencies tasked with their regulation. The experimental objective was systematically evaluate, under an array field conditions, Kentucky bluegrass (Poa pratensis L.) vigor/yield, offtake, density, color temporal a single granular made at practical rates. In May 2014 2015, plots within mature system were fertilized by conventional urea or Duration 45 polymer coated (PCU) 43.9 kg·ha?1 (0.9 lbs N·1000 ft?2); PCU (Duration 90, 120, 43% Polyon) 87.8 (1.8 ft?2). Resulting measures described dependent variables proved similar over both growing seasons highly on attribute. Following 18-week evaluations, average total percent recoveries urea, 45, Polyon (43% N) 63%, 87%, 82%, 78%, 77%, respectively. Temporal among commercial fertilizers indicates varying suitability commodity seasonal requirements. Hypothesis tests experiment-end unaccounted totals show one kg N·ha?1 100% treatments poses no environmental risk than fertilizer.