Slow Release Nitrogen Fertilizer Demonstration Trials
Summary: The turfgrass response to the fertilizers was variable and strongly influenced by time of application and condition of the turfgrass at each golf course. None of the products demonstrated improved color at 10 or 12 weeks after treatment (WAT). Only 23-5-10 applied at 1.5 or 2.5 lbs N/1000 sq ft demonstrated color improvement at 6 or 8 WAT and only at the Arrowhead location. The initiation of the trial at Virginia Country Club on April 5th was too early and bermudagrass had not fully begun to grow. Future trials should be scheduled to begin no earlier than the middle of May or later in the summer to ensure that the bermudagrass has fully transitioned and is healthy. The early trial initiation date and cool spring confounded trial ratings. Recommendations are provided to help avoid these problems in the future.
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Principal Investigator: Larry Stowell
Cooperators: Raymond Davies, Virginia Country Club, John Martinez, Arrowhead Country Club, and Greg Swanson, San Luis Rey Down Golf Course
Sponsor: J. R. Simplot
