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Nitrogen Use Efficiency and Apparent Nitrogen Recovery of Kentucky Bluegrass, Smooth Bromegrass, and Orchardgrass

^a Dep. of Agron., DMI Tillage Business Unit, CNH Global, Rt. 150E., Box 65, Goodfield, IL 61742
^b Dep. of Agron., Univ. of Wisconsin-Madison, 1575 Linden Dr., Madison, WI 53706

View larger version (18K): [in a new window]   Fig. 1. Relationship between mean annual forage dry matter (DM) yield from 1994 to 1996 and fertilizer N rate at both Arlington and Lancaster, WI, for (a) Kentucky bluegrass, (b) smooth bromegrass, and (c) orchardgrass. Models were fitted on data from all plots while symbols illustrate mean DM yield response for a given N treatment. Calculated variation of DM yield response for the model is expressed as the root mean square error (RMSE).

View larger version (19K): [in a new window]   Fig. 2. Relationship between mean annual apparent N recovery (ANR) from 1994 to 1996 and fertilizer N rate at both Arlington and Lancaster, WI, for (a) Kentucky bluegrass, (b) smooth bromegrass, and (c) orchardgrass. Models were fitted on data from all plots while symbols illustrate mean ANR response for a given N treatment. Calculated variation of ANR response for the model is expressed as the root mean square error (RMSE).

View larger version (20K): [in a new window]   Fig. 3. Relationship between mean annual N use efficiency (NUE) from 1994 to 1996 and fertilizer N rate at both Arlington and Lancaster, WI, for (a) Kentucky bluegrass, (b) smooth bromegrass, (c) orchardgrass. Models were fitted on data from all plots while symbols illustrate mean NUE response for a given N treatment. Calculated variation of NUE response for the model is expressed as the root mean square error (RMSE).