Plant‐available soil nitrogen fluxes and turfgrass quality of Kentucky bluegrass fertilized with humic substances

Abstract High quality turfgrass requires adequate amounts of nitrogen (N) fertilizer. However, excess N application can increase losses via leaching and gaseous emissions. Enhanced efficiency fertilizers (EEF) humic substances have been used to decrease the environment. A two‐year field experiment was conducted on a native soil with Kentucky bluegrass ( Poa pratensis L.) investigate if addition could be classified as an enhanced To determine this, objectives were: a) incorporating will plant‐available collected ion exchange membranes (IEM) over growing season b) release (NR) curves fertilizer treatments using mesh bag technique. Fertilizer included humic‐coated urea (HCU), poly‐coated (PCHCU), + dispersing granules (HDG), sulfur‐coated (PCSCU), stabilized N, urea, nontreated control. Overall, substance did not improve compared alone. Additionally, all had improved relative control provided acceptable for almost season. Over season, PCHCU 25% greater inorganic captured IEM other treatments. Both PCSCU show extended NR having period. In conclusion, increased concentrations, released it slowly, should EEF.