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Forage Quality of Tall Fescue across an Irrigation Gradient

USDA-ARS, Forage and Range Res. Lab., Utah State Univ., Logan, UT 84322-6300

View larger version (14K): [in a new window]   Fig. 1. Trends in crude protein (CP) of 10 tall fescue cultivars across five water levels (WLs) at three harvests. The LSD(0.05) values for differences among harvests were 4.6, 9.2, 5.7, 7.9, and 8.4 g kg-1 at WL-1 through WL-5, respectively.

View larger version (18K): [in a new window]   Fig. 2. Trends in (a) dry matter yield and (b) total protein yield for 10 tall fescue cultivars across five water levels (WLs) at three harvests. The LSD(0.05) values for differences among harvests for dry matter yield were 456, 415, 533, 313, and 491 kg ha-1 at WL-1 through WL-5, respectively. Corresponding LSD(0.05) values for total protein were 80, 84, 97, 73, and 82 kg ha-1.

View larger version (17K): [in a new window]   Fig. 3. Trends in (a) neutral detergent fiber (NDF) and (b) in vitro true digestibility (IVTD) for 10 tall fescue cultivars across five water levels (WLs) at three harvests. The LSD(0.05) values for differences among harvests for NDF were 11.1, 9.7, 6.9, 7.4, and 9.5 g kg-1 at WL-1 through WL-5, respectively. Corresponding LSD(0.05) values for IVTD were 2.8, 6.1, 2.9, 4.1, and 5.4 g kg-1.

View larger version (15K): [in a new window]   Fig. 4. Trends in (a) neutral detergent fiber (NDF) and (b) in vitro true digestibility (IVTD) for endophyte-free (Ky31e-) and endophyte-infected (Ky31e+) tall fescue across five water levels (WLs). The difference between cultivars was significant (P < 0.05) only at WL-3 for NDF [LSD(0.05) = 7.8 g kg-1]. Differences between cultivars were significant at WL-2 [LSD(0.05) = 5.4 g kg-1] and WL-3 [LSD(0.05) = 4.9 g kg-1].