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Nonstructural Carbohydrate and Digestibility Patterns in Orchardgrass Swards during Daily Defoliation Sequences Initiated in Evening and Morning

^a Dep. of Plants, Soils, and Biometeorology, Utah State Univ., 4820 Old Main Hill, Logan, UT 84322-4820
^b USDA-ARS Northwest Irrigation and Soils Research Lab., Kimberly, ID 83341-5076
^c USDA-ARS Plant Science Research Unit, and Depts. of Crop Science and Animal Science, Room 1119, Box 7620, North Carolina State Univ., Raleigh, NC 27695-7620

View larger version (32K): [in a new window]   Fig. 1. Removal of 0.33 (shaded horizons) of orchardgrass sward height at the beginnings and ends of 6-h intervals in 24-h defoliation sequences initiated at 1900 (PM) and 0700 (AM) h. Control samples from intact swards were also clipped and sectioned into horizons at each time.

View larger version (19K): [in a new window]   Fig. 2. Herbage a) TNC; and b) IVTDMD concentration in combined orchardgrass control horizons (reconstituted swards) at 6-h intervals during October, June, and August.

View larger version (40K): [in a new window]   Fig. 3. Herbage TNC concentrations during a) October; b) June; and c) August in successively lower horizons of orchardgrass from control and treatment areas during defoliation sequences initiated at 1900 (PM) and 0700 (AM) h.

View larger version (41K): [in a new window]   Fig. 4. Herbage IVTDMD concentrations during a) October; b) June; and c) August in successively lower horizons of orchardgrass from control and treatment areas during defoliation sequences initiated at 1900 (PM) and 0700 (AM) h.