Creeping Bentgrass response to a stabilized amine form of nitrogen fertilizer

摘要

PiNT+potassium (PiNT+K) is a newly developed amine form of N fertilizer that is stabilized by reaction with the potassium cation. The influence of PiNT+K and an analog fertilizer (KN03 and NH4NO3) on the quality of creeping bentgrass were compared atdifferent N rates (0, 25, 37.5 and 50 kg N/ha). At the same N rate, the normalized difference vegetation index (NDVI) of the PiNT+K treatments was 2-3% higher than the analog treatments, while the dark green color index (DGCI) was 4-7% higher. Fertilizerburn (osmotic desiccation) was observed on plots treated with the analog fertilizer, but treatments with PiNT+K appeared safe from osmotic desiccation even at high N rates. The application N rate of 37.5 kg N/ha of PiNT+K outperformed the analog fertilizer at 50 kg N/ha when the quality of creeping bentgrass, turfgrass management, and N use efficiency were considered. The PiNT+K treatment yielded better quality as measured by NDVI and DGCI, yielded similar above-ground biomass, and had less unused N (Napplication - N uptake) in comparison to the analog fertilizer.