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Nitrogen Use Efficiency and Morphological Characteristics of Timothy Populations Selected for Low and High Forage Nitrogen Concentrations

^a Agriculture and Agri-Food Canada, 2560 Hochelaga Bd., Sainte-Foy, QC, G1V 2J3, Canada. Contribution no. 639 Agriculture and Agri-Food Canada

View larger version (24K): [in a new window]   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

View larger version (27K): [in a new window]   Fig. 2 Nitrate N, and soluble and insoluble N in forage of timothy populations selected for high (N+) and low (N-) forage N concentration and of a check (champ). grown under limiting to nonlimiting N rates during the second regrowth cycle (Phase 2). In the first regrowth cycle (Phase 1), data were obtained under one N rate. Standard errors of the mean are presented as vertical bars

View larger version (24K): [in a new window]   Fig. 3 Root to total biomass ratios for DM yield and N accumulation, leaf weight ratio (LWR), and leaf N accumulation ratio of timothy populations selected for high (N+) and low (N-) forage N concentration and of a check (`Champ') grown under limiting to nonlimiting N rates in the second regrowth cycle (Phase 2). In the first regrowth cycle (Phase 1), data were obtained under one N rate. Standard errors of the mean are presented as vertical bars

View larger version (18K): [in a new window]   Fig. 4 Specific leaf area (SLA), tiller number, and leaf elongation rate (LER) of timothy populations selected for high (N+) and low (N-) forage N concentration and of a check (`Champ') grown under limiting to nonlimiting N rates during the second regrowth cycle (Phase 2). Standard errors of the mean are presented as vertical bars