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Coastal Bermudagrass, Bahiagrass, and Native Range Simulation at Diverse Sites in Texas

^a USDA-ARS, Grassland, Soil and Water Res. Lab., 808 East Blackland Rd., Temple, TX 76513
^b USDA-ARS, 430 Heep Center, Texas A&M Univ. College Station, TX 77843-2474
^c Texas A&M Univ. Agric. Res. and Ext. Center, P.O. Box E, Overton, TX 75684
^d Texas Agric. Exp. Stn., 808 E. Blackland Rd., Temple, TX 76513
^e USDA-NRCS, P.O. Box 6567, Fort Worth, TX 76115
^f USDA-NRCS, 2301 N. Travis Ave., P.O. Box 1027, Cameron, TX 76520-1027
^g USDA-NRCS, 101 S. Main, Temple, TX 76501-7682

View larger version (58K): [in this window] [in a new window]   Fig. 1. Counties where coastal bermudagrass and native range were simulated. Four of these also had simulations of bahiagrass: Grimes, Lamar/Delta, Smith, and VanZandt Counties. Lamar/Delta and Brown/Mills were each reported in one soil survey, so each pair was treated as one county.

View larger version (17K): [in this window] [in a new window]   Fig. 2. An example demonstrating how radiation use efficiency (RUE) is calculated. This is the aboveground dry biomass of coastal bermudagrass at Temple, TX in 2000 as a function of summed intercepted photosynthetically active radiation (IPAR). The slope is the RUE.

View larger version (23K): [in this window] [in a new window]   Fig. 3. Nitrogen concentrations on different dates for (a) coastal bermudagrass, (b) Pensacola bahiagrass, (c) buffalograss, (d) sideoats grama, and (e) blue grama. The regressions are compared in (f). "T" designates the Temple, TX location, "M" designates the Maysfield, TX location, and "W" designates Wills Point, TX location. Symbols represent different years at each location as T 1998 (solid circles), T 1999 (open circles), T 2000 (solid diamond), T 2003 (open diamond), T 2005 (solid square), M 2005 (open square), W 2003 (solid triangle), W 2004 (open triangle), and W 2005 (solid squares). The fit equations (indicated by the solid lines) are coastal bermudagrass: Y = 0.0010616 + 36649.5 X–3.0745) n = 22; r2 = 0.78); bahiagrass: Y = 0.00107 + 1389.64 X–2.4625 (n = 21; r2 = 0.93); buffalograss: Y = 0.0095 + 19.77 X–1.500 (n = 10; r2 = 0.72); sideoats grama: Y = 0.0136 + 309500 X–3.742 (n = 11; r2 = 0.68); blue grama: Y = 0.0206 + 8876.6 X–3.227 (n = 11; r2 = 0.17). For (f), regression symbols are coastal bermudagrass (open circle), bahiagrass (solid circle), buffalograss (solid diamond), sideoats grama (open diamond), and blue grama (solid squares).

View larger version (15K): [in this window] [in a new window]   Fig. 4. For coastal bermudagrass, simulated and measured yield responses to applied nitrogen for 2 yr at Eagle Lake, TX. Measured rainfall values were 1444 mm in 1979 and 817 mm in 1980.

View larger version (14K): [in this window] [in a new window]   Fig. 5. For bahiagrass, simulated and measured yield responses to applied nitrogen for 2 yr at Eagle Lake, TX. Measured rainfall values were 1444 mm in 1979 and 817 mm in 1980.