Fig. 1 Nitrogen accumulation as a function of total biomass and forage DM yield of timothy populations selected for high (N+) and low (N-) forage N concentration and of a check (`Champ'). In the first regrowth cycle (Phase 1), data were obtained under one N rate. In the second regrowth cycle (Phase 2), data for each N rate are joined by dotted lines, and the four N rates are indicated. Standard errors of the mean are presented as horizontal bars to compare population DM yields, and as vertical bars to compare population N accumulations
