Case Study: Rya GC—Precision Moisture Control

Maintaining uniform green speed and surface quality across a course—throughout the entire season—is one of the greatest challenges for greenkeepers. TourTurf® FTE can help you to optimize soil moisture levels and playing surface quality.

RyaGK_Article_Header BlogPostArticleImage

Sean Gilmour, the course manager at Rya Golfclub, recently installed the Agrodit system to easily control soil parameters. The results document how TourTurf® FTE helps in regulating soil moisture to achieve optimum levels.

Sean says: “The greens are now constantly firm and still able to hold moisture!”

FTE BlogPostArticleImage

TourTurf® FTE Respond® Extreme Fine Turf Enhancer is the ideal wetting agent for the Northern Hemisphere to promote finer grasses and encourage rooting. FTE has the optimum ratio between penetrants and retaining agents, so water is not just held within the upper root zone. The long-chain surfactant molecules are resistant to quickly being flushed out of the rootzone by irrigation water.

RyaGK_Article_Image_ProbeDevice BlogPostArticleImage

The Agrodit sensors are permanently installed in the greens and track soil moisture, salt levels and soil temperature at three depths:

  • 0-5 cm

  • 5-10 cm

  • 10-20 cm

Rya Golf Club has a long and proud history dating back to 1934 starting with a 9-hole course. In 1956, the 18-hole course in Öresund was inaugurated.

As the club has developed, the course layout has been refined. Latest in 2019, an extensive remodelling of holes 12-14 was carried out.

RyaGK_Article_Image_SignEntry BlogPostArticleImage

The course is in fantastic condition, and you hardly notice the differences from the construction phases. Green 7 and the Putting Green are built as a California green. A California green is a construction method where 30–40 cm of straight sand is laid directly over the native soil.

The Putting green is very sandy and located only 50 meters from the sea.

Green 15 is a push-up green. A push-up green is a traditional style of putting green built by shaping and compacting the existing native soil. Typically topped with 10–15 cm of sand or amended soil.

With the recently installed monitoring system, the Greenkeeping team can adapt irrigation cycles better to the actual needs and optimise the performance of the putting surface. It became obvious that the use of TourTurf® FTE greatly helps in penetration of irrigation water deep enough to keep the putting surface firm and dry while retaining enough water for turf roots reaching deeper.

See some examples:

RyaGK_Article_Image_PRSouth BlogPostArticleImage

The moisture on the Putting Green stays consistently at 15% moisture at 5-10 cm and at around 13% moisture at 10-20cm.

From 0-5cm the moisture spikes from irrigation May 13 and May 15 but quickly returns to low levels of around 7% moisture.

The same general effect can be seen for Green 7 west and Green 7 south.

RyaGK_Article_Image_G7West-0306 BlogPostArticleImage

Moisture at 5-10cm and 10-20cm stays almost constant at 17%, 12% moisture respectively while the moisture in the top layer 0-5 cm quickly reduces down to 7%.

The surface stays firm. Poa annua with its shallow root system is discouraged from invading. Deeper rooting grass species can easily reach available soil moisture.

RyaGK_Article_Image_G7South-0306 BlogPostArticleImage

RyaGK_Article_Image_G15NE-1505 BlogPostArticleImage

On Green 15 you can again clearly see the spike at 0-5cm from irrigation on May 13.

On May 15, it’s nearly back down to where it was to begin with.

You only see a tiny spike from irrigation deeper in the soil. It's remarkable how consistent the soil moisture is at depth.

Reo BlogPostArticleImage

 

Comparison of FTE vs. TourTurf® REO on the Putting Green – September 2025

In September 2025, a trial was conducted on the putting green, comparing one half treated with FTE with the other half treated with TourTurf® REO, our fully organic wetting agent.

REO acts as a traditional wetting agent with strong water-retaining properties.

The graphs show that under REO treatment, soil moisture in the top 0–5 cm remains high after irrigation.

In contrast, with FTE, moisture in the top 5 cm decreases rapidly, resulting in reduced water retention in the surface layer of the putting green, allowing water to penetrate much deeper into the soil profile.

RyaGK_Article_Image_CupCutter BlogPostArticleImage

The water is precisely where the roots are, as seen in this 20cm deep cup cutter. Desired grass species are encouraged to grow. The putting surface is true, consistent and very firm.

Initial results from Rya Golfclub are very promising: improved moisture control and more consistent greens.

As Sean and his team continue to monitor performance, TourTurf® FTE is proving to be a key tool in delivering perfect playing conditions while promoting sustainable water use.

Related posts