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Bermudagrass Seasonal Responses to Nitrogen Fertilization and Irrigation Detected Using Optical Sensing

^a Dep. of Agronomy, Univ. of Florida, Gainesville, FL 32611
^b Dep. of Horticulture and Landscape Architecture
^c Dep. of Biosystems and Agricultural Engineering
^d Dep. of Plant and Soil Sciences, Oklahoma State Univ., Stillwater, OK 74078. Approved for publication by the Director of the Oklahoma Agricultural Experiment Station. Funding provided by the Oklahoma Turfgrass Research Foundation grant number AG-89-RS-140, The Oklahoma Agricultural Experiment Station project number OKLO 2392, and Toro Center for Advanced Turf Technology

View larger version (22K): [in this window] [in a new window]   Figure 1. Seasonal trends in bermudagrass (Cynodon dactylon L.) growth characterized by normalized difference vegetation index (NDVI), green normalized difference vegetation index (GNDVI), red light reflectance in relation to near infrared reflectance (R/NIR), and green light reflectance in relation to near infrared reflectance (G/NIR) in 2003 and 2004.

View larger version (22K): [in this window] [in a new window]   Figure 2. Frequency of bermudagrass (Cynodon dactylon L.) responses equal to or greater than minimum acceptable and target normalized difference vegetation index (NDVI) under irrigation and N treatment combinations in 2004.