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.