Turf Compaction Comparison Report
Play golf and ride in a golf cart. It is almost a given these days. But the traffic jam caused by golf carts is getting out of control and is taking an increasing toll on turf. There have been several good research studies in recent years documenting the impact of golf carts on turf wear, and this article will examine these effects by letting the numbers tell the story.
CART DAMAGE DEFINED
Several studies have analysed the turf damage caused by golf carts and other turf vehicles. The impacts can be broken down into two broad categories: • Turf injury - The wear damage caused by vehicles is inﬂuenced by the speed of travel and the amount of stopping, starting, and turning. The tread design of tires also aﬀects wear damage. Wear symptoms include leaf tissue matting and a subsequent exposure of underlying thatch. With additional traﬃc, leaf blades are bruised. Ruptured cells eventually give turf a dark, water-soaked appearance. Wilt sets in as water is lost from the leaves, eventually causing a loss of chlorophyll and cell death. • Soil compaction - The soil compaction caused by carts reduces the shoot growth rate and the recuperative potential of turf grass. Compaction reduces air and water porosity within the soil as well as water movement through the soil proﬁle. Soil compaction can impact turf growth for several weeks or months, resulting in the total loss of turf cover and chronic problems with poor drainage and the invasion of weeds that prefer compacted soil conditions. There are other variables, such as soil type and moisture levels, which further impact wear stress. Research by Carrow and Johnson noted that turf- grass growing on sandy soils and some clay soils is more prone to wear injury. Soil compaction is greatest when traﬃc is imposed over excessively wet soils. Any factor reducing turf growth rate, such as soil compaction, high external salt levels, and frozen soils causes a further increase in wear damage compared to a vigorously growing turf.
AREA IMPACTED –WHERE THE RUBBER MEETS THE TURF
The damage caused by various modes of transportation can be estimated by measuring the contact area of shoes or tyres and multiplying this over the total area covered during a round of golf. The following example illustrates the average area impacted while playing a 5,700-metre golf course:
• Walking golfer with golf bag = 120 sq metres
• Golf Skate Caddy with 7.5cm wide wheels = 1,026 sq metres*
• Walking golfer using a pull cart with 7.5cm wide wheels = 1,200 sq metres
• Self balancing 2 wheel vehicle with gyroscopic control set up for golf with large 20cm wide turf tyres = 2,200 sq metres**
• Golf cart = 5,745 sq. metres
• Two golfers each using a golf cart = 11,490 sq. metres.
The preceding examples paint a clearer picture of why golf carts cause signiﬁcant damage to golf courses.
By analysing the numbers, we can learn the following lessons: • All vehicles cause turf damage. This includes motorized golf carts, pull carts, and maintenance vehicles. Some of the damage may not be visible for days or even weeks as a result of the eﬀects of soil compaction. • Walking the golf course and carrying your clubs impacts the golf course far less than pull or motorized carts based on the total amount of area impacted. • The Golf Skate Caddy impacts the golf course less then or equal to a pull cart based on the fact that the 2 rear wheels will follow the same pattern of the front wheels most of the time and you do not have as in a pull cart the combined surface area of the two wheels and the golfers foot print. • Pull carts impact the golf course less than motorized carts, but all carts impact the golf course more than walking. This is due to the smaller area contacted by foot traﬃc and the wheels of the pull cart. • Vehicle traﬃc has the greatest impact on wear and soil compaction due to the amount of area covered and the increased damage caused by repeated traﬃc over a concentrated area. Damage is further increased with a greater number of turns, a higher speed of travel, and the number of traﬃc passes over a given area. Based on the research results, the main focus for minimizing the damage caused by golf carts should be on spreading traﬃc over a wider area or restricting golf carts to paths. • There is some evidence to suggest that the newer designs of golf carts can reduce the overall impact on turf injury due to wider tires and smoother tread design.
GOLF SKATE CADDY VERSES GOLF CART IMPACTION ON GOLF COURSE
From these charts and information it can be seen that the best case scenario is to walk the course carrying your bag. However in today’s busy and hectic lifestyle many golfers like the convenience of using a traditional golf cart and although the Golf Skate Caddy is 1.41 psi heavier than a golf cart with 2 people, the actual impaction per square metre compared to a golf cart is a massive 82% less on the surface area of the golf course and similar to or less than a golfer walking with a pull cart. Now that’s amazing!
Carrow, R. N. 1997.Tire change oﬀers small decline in turf wear. Golf Course Management. 65(5):49-51.
Carrow, R. N. 1996. Turfgrass wear stress: Eﬀects of golf car and tire design. J.Amer. Sac. Hart. Sci. 31(6):968-971.
Carrow, R. N., and B.J.Johnson. 1989. Turfgrass wear as aﬀected by golf car tire design and traﬃc patterns. J.Amer. Soc. Hart. Sci. 114(2):240-246.
Gross, P.2002. "Trolley follies." USGA Green Section Record 40(5): 19-22.
Vavrek, R. 2002. "How much traﬃc can you bear?" USGA Green Section Record 40(4):1-6.
*Golf Skate Caddy Calculation for surface area estimated with the following calculation
2 tyres x 7.5cm (0.075m) x 5,700 metres + 20% contingency = 1,026 M/sq
** Tyre speciﬁcation taken from Segway Golf x2 Turf using low pressure 20cm wide tyres. Calculation 2 x 20cm (.2m) x 5,700 metres = 2,280 M/sq