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The Fate of Nitrogen-15 Ammonium Sulfate Applied to Kentucky Bluegrass and Perennial Ryegrass Turfs

^a The Norwegian Crop Research Institute, Plant Protection Centre, Høgskoleveien 7, 1432 Ås, Norway
^b Department of Natural Resources and Environmental Sciences, University of Illinois, W-421 Turner Hall, 1102 S. Goodwin Dr., Urbana, IL 61801
^c Department of Horticulture, 305 Alderman Hall, 1970 Folwell Ave., University of Minnesota, St. Paul, MN 55108

View larger version (18K): [in a new window]   Fig. 1. Cumulative clipping yield (upper) and total N (lower) harvested in clippings from Kentucky bluegrass and perennial ryegrass microplots from 15 June 1994 to 15 June 1995.

View larger version (17K): [in a new window]   Fig. 2. Cumulative labeled fertilizer nitrogen (LFN) harvested in Kentucky bluegrass (KB) and perennial ryegrass (PR) clippings from 15 June 1994 to 15 June 1995.