US see decrease in applied nutrients usage

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Golf courses in the US decreased the use of nitrogen, phosphorous and potassium in 2021, compared with usage in 2006, according to recently released survey data from the Golf Course Superintendents Association of America (GCSAA).

The report found that the use of nitrogen (N) decreased by 41 percent; the use of applied phosphorus (P2O5) decreased by 59 percent; and the use of applied potassium (K2O) decreased by 54 percent in 2021, compared with usage in 2006. The reduction of applied N, P2O5, and K2O since 2006 is likely a result of reduced application rates and a reduction in fertilised acres due to facility closures.

The most significant nutrient reduction occurred with applied P2O5. This reduction appears to be at least partially a result of mandated phosphorous restrictions, which was the most common restriction reported by facilities. Several facilities also reported they did not apply any P2O5 at all in 2021.

“The latest national survey results continue to demonstrate golf course superintendents’ dedication to being responsible environmental stewards,” said Rhett Evans, CEO of GCSAA.

“Through their work and focus on the environment, superintendents are more perspicacious with their use of nutrients, enabling healthier green spaces today and for the future.”

The survey results from more than 1,400 greenkeepers were collected and independently analysed by scientists Travis Shaddox, PhD and J Bryan Unruh, PhD, and the National Golf Foundation, which published the findings for peer review before making the information public.