Fig. 1. Endophyte infection frequency of tall fescue tillers during the period of 1983 to 1996 as affected by endophyte infection level at planting (low = 7% seed infection, high = 80% seed infection), fertilization (low = 13.4–1.5–5.6 g N–P–K m^–2 yr^–1, high = 33.6–3.7–13.9 g N–P–K m^–2 yr^–1), and cultivar (Triumph and Johnstone). Lines represent linear regression, the results of which are specified in the text.