Extending Greenseeker Technology to Bermudagrass Pasture Land.

The Greenseeker technology allows producers to estimate yield potential and obtain N fertilization rates recommendations from field NDVI readings based on algorithms developed by Oklahoma State University and Noble Foundation. These algorithms are available as a web-based tool: Sensor-Based Nitrogen Rate Calculator. The algorithms parameters for wheat and corn are considered very robust conferring accurate estimates for yield and N recommendations due to extensive multi-year/location data collection. Nowadays, efforts in extending the Greenseeker use to improved bermudagrass pasture lands is being made; however, bermudagrass parameters are not robust enough for accurate N fertilization recommendations. Our objective was to collect extensive multi-year/location data in Oklahoma State for improving the existing bermudagrass algorithm. Bermudagrass plots with different Nitrogen rates were set in seven Oklahoma counties by their respective County Educator Agents. Central, Northeast, southeast, and Northwest Oklahoma regions were represented in this study which includes most of the climate and soil variation within the State. Nitrogen rates such as 0, 25, 50, 75 and 100 were applied late spring, NDVI readings collected every two weeks and biomass samples collect close to bermudagrass sward stage which agrees with hay harvesting period.