"Nitrogen Fertilizer / Source Effect on Kentucky Bluegrass"
Date:
July - September 2001
Conductors:
John R. Street, Deborah D. Holdren, Pamela J. Sherratt
Department of Horticulture and Crop Science
The Ohio State University
Synopsis:
Results of the 12-week study reflect the efficiency of AGROTAIN products (UMAXX, UFLEXX, Super N Concentrate) containing Stabilized Nitrogen Technology as compared to urea alone, and that of several slow-release fertilizers. In the study, each nitrogen source was applied to a 3x10 ft plot at one lb per 1,000 sq ft. The study also included an untreated check plot.
While every treated plot fared better than the check plot, the study found that UMAXX consistently exhibited better turf quality than urea alone, and better than or equal ratings to other slow-release nitrogen sources. The study also found that UFLEXX exhibited turf quality comparable to or better than most other nitrogen sources, while Super N Concentrate provided a turf quality response similar to that of UMAXX.
University of Wisconsin
Research Study:
"Effects of N-(nbutyl)thiophoshoric tiamide (NBTP) and dicyandiamide (DD) on the efficacy of urea applied to turfgrass in the greenhouse"
Date:
2007 / 2008
Conductors:
W.R. Kussow, D.J. Soldat
Synopsis:
Results of the three-week study reflect ways to inhibit the action of urease, thereby minimizing the effects of volatilization. The study compared different products intended to slow urea hydrolysis, ultimately determining how and to what degree urea needs to be altered to impact the efficacy of urea as a turfgrass fertilizer. The study, which compared urea alone, UMAXX, Nutralene, SCU and a control group, applied fertilizer at the rate of 1 lb N/M.
After the data was collected, UMAXX showed significantly lower volatilization rates on creeping bentgrass than both Nutralene and SCU, and was not significantly different from the control group, which didn't have any nitrogen applied to it. On perennial ryegrass, UMAXX showed significantly lower volatilization rates than urea alone.
Results of the study concluded that products containing Stabilized Nitrogen Technology proved to be effective at reducing nitrogen loss due to ammonia volatilization.
Florida Turf Grass Institute
Research Study:
Evaluate Nitrogen Release and Leaching Potential
Conductors:
Florida Turf Grass
Synopsis:
The 112-day study used a natural field environment to compare a Stabilized Nitrogen product against sulfur-coated urea, IBDU and urea alone to determine the effects of leaching.
Upon conclusion, it was determined that the Stabilized Nitrogen product leached significantly less nitrogen over the span of the study period as did urea and approximately the same quantity as sulfur-coated urea. In addition, the Stabilized Nitrogen product slowed the rate of leaching of all forms of nitrogen studied relative to soluble urea.
International Plant Nutrition Institute
Research Study:
"Nitrogen Rate and Source Effects on Nitrous Oxide Emissions from Irrigated Cropping Systems in Colorado"
Date:
2007 / 2008
Conductors:
Arddell D. Halvorson, Stephen J. Del Grosso, Francesco Alluvione
Synopsis:
Results of the multi-year study find ways to curb nitrous oxide emissions without compromising the application of nitrogen for healthier plants. The study compared nitrous oxide emissions from a variety of sources including urea alone, controlled release and AGROTAIN products (SuperU, AgrotainPlus) containing Stabilized Nitrogen Technology.
Over the course of the growing season, dry granular had the greatest nitrous oxide emissions, while Stabilized Nitrogen products were among the lowest levels. In fact, when compared to urea alone, SuperU reduced nitrous oxide emissions by 48 percent.
