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Nitrogen Fertilization Affects Bahiagrass Responses to Elevated Atmospheric Carbon Dioxide

^a Texas A&M Univ. Research and Extension Center, 1229 North U.S. Hwy. 281, Stephenville, TX 76401
^b Agronomy Dep., Univ. of Florida, Gainesville, FL 32611-0300
^c USDA-ARS, P.O. Box 110965, Gainesville, FL 32611-0965
^d Statistics Dep., P.O. Box 110339, Gainesville, FL 32611-0339

View larger version (41K): [in a new window]   Fig. 1. Example of treatment layout in a temperature-gradient greenhouse (not to scale). One greenhouse is shown and represents one replicate of one CO2 main plot. Unidirectional arrows indicate the direction of airflow. BG-80 and BG-320 are bahiagrass fertilized at 80 and 320 kg N ha–1 yr–1, respectively; RP = rhizoma peanut stands on which data were not collected for this study.

View larger version (21K): [in a new window]   Fig. 2. Monthly averages of average daily temperature in Greenhouse 1 for baseline (B) through B + 4.5°C temperature treatments during 1998.

View larger version (28K): [in a new window]   Fig. 3. Dry matter (DM) yield by harvest of bahiagrass fertilized at 80 (BG-80) or 320 kg N ha–1 yr–1 (BG-320) under ambient (360 µmol mol–1) and enriched (700 µmol mol–1) CO2 levels for 1998 and 1999. There were no CO2 effects at any harvest for BG-80 in 1998 (P > 0.16) or 1999 (P > 0.50). For BG-320, P values for Harvests 1 through 4 were 0.26, 0.02, 0.09 and 0.05, respectively, in 1998, and 0.09, <0.01, 0.42, and 0.18, respectively, in 1999.