Fig. 1. Concentration of NO3–N in leachates collected under annual bluegrass ecotypes from Canada and the USA, and bentgrass (Agrostis spp.) species grown in lysimeter columns for 57 d with fertilizer application every 14 d during 2002 at Guelph, ON, Canada. Arrows indicate the fertilizer treatment application day. Concentrations are averaged across ecotypes or cultivars.