N fertilization experiment plant species composition data for north of the saddle from 2011 to ongoing, yearly

In August 2010, N fertilization plots were established over a gradient of Geum rossii (Aco) and Deschampsia caespitosa (Des) cover in an area of moist-wet meadow alpine tundra north of the Saddle on Niwot Ridge. A total of 20 plots were set up, with 1X-10X being control plots where no nitrogen (N) was added, and 1N-10N being fertilization plots where N was added. Control and fertilized plots were paired so that pairs had the same percent cover of Aco and Des. Initially in 2010, N addition plots were fertilized at a rate of 28.8 g N x m^2 x yr^-1 (72 g of slow-release Osmocote (40-0-0)). In 2011 fertilization rate was reduced to N x m^2 x yr^-1 (25 g Osmocote (2011-2013), Duration Urea 120, 40-0-0, SGN 150 (2014-on).