Subground irrigation systems (SIS) have been proposed as the best method to conserve water and over the past 60 years several SIS designs have been installed on golf courses or athletic fields, however, all essentially failed due to the lack of research and because SIS were impractical for golf because they required flat surfaces. The Variable Depth Rootzone (VDR) diverges from USGA Recommendations by decreasing the rootzone depth at the top of slopes (8–10 inches) and making the rootzone thicker in low lying areas (14-16 inches). Research has indicated that VDR have a more uniform moisture retention and they have been considered for inclusion in USGA Recommendations but have not been added because the only study performed with VDR was insufficiently replicated. In the summer of 2022 Frontier Golf constructed a putting green research site at Michigan State University that includes 3 VDR and 3 SIS with slopes of 1.5, 3, and 5% each. The green surfaces have sufficient density entering winter and we will initiate a study in the spring of 2023 comparing the two systems regarding water use, energy use, pest outbreaks, organic matter build up, and playability factors such as surface firmness and green speed.
CTRF
