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Alfalfa Root Carbohydrates and Regrowth Potential in Response to Fall Harvests

^a Département de Phytologie, Université Laval, Sainte-Foy, QC, Canada G1K 7P4
^b Agriculture and Agri-Food Canada, Sainte-Foy, QC, Canada G1V 2J3

View larger version (18K): [in a new window]   Fig. 1. Daily average air and soil temperatures in the unheated greenhouse throughout the overwintering period.

View larger version (47K): [in a new window]   Fig. 2. Root dry weight (A, B) and shoot dry weight (C, D) of two alfalfa cultivars (AC Caribou and WL 225) harvested twice or three times with a fall harvest taken at 400, 500, or 600 GDD after the second harvest. Root DW was measured at each harvest date for the corresponding harvest treatment (Harvests): on 7 Aug. 1997 for plants harvested twice, on 8 Sept., 17 Sept., or 7 Oct. 1997 for plants harvested respectively at 400, 500, or 600 GDD after the second harvest. Root DW was also measured on three other occasions for all harvest treatments on 10 Nov. 1997, 12 Jan. 1998, and 11 Mar. 1998. Shoot DW was measured on 2 Dec. 1997, 4 Feb. 1998, and 2 Apr. 1998 after 3-wk regrowth periods initiated respectively on 10 Nov. 1997, 12 Jan. 1998, and 11 Mar. 1998. Vertical bars indicate SEM for each sampling date.

View larger version (51K): [in a new window]   Fig. 3. Root concentrations of raffinose (A, B), stachyose (C, D), and sucrose (E, F) of two alfalfa cultivars (AC Caribou and WL 225) harvested twice or three times with a fall harvest taken at 400, 500, or 600 GDD after the second harvest. Concentrations were measured at each harvest date for the corresponding harvest treatment (Harvests): on 7 Aug. 1997 for plants harvested twice, on 8 Sept., 17 Sept., or 7 Oct. 1997 for plants harvested respectively at 400, 500, or 600 GDD after the second harvest. Concentrations were also measured on three other occasions for all harvest treatments on 10 Nov. 1997, 12 Jan. 1998, and 11 Mar. 1998. Vertical bars indicate SEM for each sampling date.

View larger version (50K): [in a new window]   Fig. 4. Root concentrations of starch (A, B) and TNC (C, D) of two alfalfa cultivars (AC Caribou and WL 225) harvested twice or three times with a fall harvest taken at 400, 500, or 600 GDD after the second harvest. Concentrations were measured at each harvest date for the corresponding harvest treatment (Harvests): on 7 Aug. 1997 for plants harvested twice, on 8 Sept., 17 Sept., or 7 Oct. 1997 for plants harvested respectively at 400, 500, or 600 GDD after the second harvest. Concentrations were also measured on three other occasions for all harvest treatments on 10 Nov. 1997, 12 Jan. 1998, and 11 Mar. 1998. Vertical bars indicate SEM for each sampling date.

View larger version (46K): [in a new window]   Fig. 5. Root pools of raffinose (A, B), stachyose (C, D), and sucrose (E, F) of two alfalfa cultivars (AC Caribou and WL 225) harvested twice or three times with a fall harvest taken at 400, 500, or 600 GDD after the second harvest. Pools were measured at each harvest date for the corresponding harvest treatment (Harvests): on 7 Aug. 1997 for plants harvested twice, on 8 Sept., 17 Sept., or 7 Oct. 1997 for plants harvested respectively at 400, 500, or 600 GDD after the second harvest. Pools were also measured on three other occasions for all harvest treatments on 10 Nov. 1997, 12 Jan. 1998, and 11 Mar. 1998. Vertical bars indicate SEM for each sampling date.

View larger version (43K): [in a new window]   Fig. 6. Root pools of starch (A, B) and TNC (C, D) of two alfalfa cultivars (AC Caribou and WL 225) harvested twice or three times with a fall harvest taken at 400, 500, or 600 GDD after the second harvest. Pools were measured at each harvest date for the corresponding harvest treatment (Harvests): on 7 Aug. 1997 for plants harvested twice, on 8 Sept., 17 Sept., and 7 Oct. 1997 for plants harvested respectively at 400, 500, or 600 GDD after the second harvest. Pools were also measured on three other occasions for all harvest treatments on 10 Nov. 1997 and 12 Jan. and 11 Mar. 1998. Vertical bars indicate SEM for each sampling date.