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Currently, it is estimated that 50 to 60% of the N applied fertilizer is actually utilized by the crop with the remaining N lost through leaching or denitrificatio n. A three year study was conducted at eight locati ons in North Carolina to examine the impact of Nutrisphere ™ on corn yield, optimum N rate, maximum yield, tissue N concentration, plant biomass and N uptake. At six locations the study consisted of a split pl ot design where main plots were either 30% Urea Ammonium Nitrate (UAN) or 30% UAN plus Nutrisphere™ applied either at planting or layby with subplots c onsisting of five N rates that differed slightly ac ross years. At two locations, two N solutions were applied at t wo rates to plots that received one of two starter fertilizer treatments. The overall trend indicated that Nutris phere™ increased yield compared to the use of 30% UAN alone with a significant (p<0.10) yield increases o f 0.74 Mg ha -1 from combined results at Bertie08 and Pamlico08, 0.93 Mg ha -1 from combined results at Guilford08 and Forsythe08 and 0.37 Mg ha -1 from the treatment with at planting application of N at Beau fort09 and Pamlico09. While Nutrisphere™ only reduced optimum N rate in two trials, there was a consisten t increase in maximum potential yield across trials . Plant analysis found that Nutrisphere™ increased biomass at one location, although it did not affect tissue N concentration and did not result in consistent incr eases in plant N uptake. The significant impacts of Nutrisphere™ on plant biomass and corn yield indicate that it affects the N movement to the root surfa ce over a short period of time after application. More research is needed to determine how Nutrisphere™ impacts N movement in the soil, N transformations a nd N uptake to improve recommendations regarding its use and potential for increasing yield.

THE IMPACT OF THE POLYMER COATING NUTRISPHEREâ¢ IN INCREASING NITROGEN USE EFFICIENCY AND CORN YIELD

THE IMPACT OF THE POLYMER COATING NUTRISPHEREâ¢ IN INCREASING NITROGEN USE EFFICIENCY AND CORN YIELD