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Nitrogen Removal by Orchardgrass and Smooth Bromegrass and Residual Soil Nitrate

^a USDA-ARS, National Soil Tilth Laboratory, Ames, IA 50011-4420
^b Dep. of Agronomy, Iowa State Univ., Ames, IA 50011-1010

View larger version (27K): [in a new window]   Fig. 1. Nitrogen removal at fertilization rates of 224, 448, and 672 kg N ha-1 year-1 in orchardgrass and smooth bromegrass in a three-harvest system in 1999 and 2000, near Pittstown, NJ. Vertical bars are the LSD at the 0.05 significance level and compare N rate means for the same species and the same or different harvests.

View larger version (28K): [in a new window]   Fig. 2. Nitrogen removal within three growth cycles in orchardgrass and smooth bromegrass at 224, 448, and 672 kg N ha-1 yr-1 in a three-harvest system in 1999 and 2000, near Pittstown, NJ. *, **, and *** indicate significance at 0.1, 0.05, and 0.01.

View larger version (21K): [in a new window]   Fig. 3. Total nitrogen removal in orchardgrass and smooth bromegrass at 224, 448, and 672 kg N ha-1 yr-1 in 1999 and 2000, near Pittstown, NJ.

View larger version (30K): [in a new window]   Fig. 4. Residual soil NO3–N in orchardgrass and smooth bromegrass at 224, 448, and 672 kg N ha-1 yr-1 from the 0- to 0.3- and 0.3- to 0.6-m soil depths at four harvests in 1999 and 2000, near Pittstown, NJ. Harvest 4 corresponds to sampling after a killing frost. Vertical bars identify LSD to separate soil depth means for the same N rate, species, harvest, and year at the 0.05 significance level.