Fig. 3. Quality response of turfgrass during seven different rating periods (monthly) at the Research Farm 1998 (A, B) and 1999 (C, D), and Spring Manor Farm 1998 (E, F) and 1999 (G, H). Rating periods correspond to months (1 = May, 7 = Nov.) and arrows indicate dates of fertilization. Dashed lines indicate the acceptable quality rating of 6.