Fig. 2. Tissue N concentration response of turfgrass during five harvest periods at the Research Farm 1998 (A, B) and 1999 (C, D), and Spring Manor Farm 1998 (E, F) and 1999 (G, H). Harvest periods correspond approximately to months (1 = May/June, 5 = Oct.). Arrows indicate dates of fertilization. The first fertilization occurred before the first harvest period.