By John Mascaro, President of Turf-Tec International

Ensuring the safety and playability of sports fields is crucial for player performance and injury prevention. For sports field safety and playability, three points of data are needed. This article will explore the methodologies and standards for evaluating natural grass and synthetic turf surfaces, emphasizing the importance of consistency across playing fields.

To measure an exact position on Earth, three points of reference are needed. Before GPS, navigators used the positions of stars, the sun, and the moon to determine their position on the earth’s surface. This was done using instruments like sextants.

Today, GPS relies on a process called trilateration. Trilateration uses signals from at least three satellites to determine a receiver’s position. Each satellite provides a sphere of possible locations where the receiver could be located. The intersection of these three spheres pinpoints the exact location on the earth’s surface.

Natural Grass Surfaces

Three points of reference are also needed to determine playability for safe sports fields on natural grass surfaces, they include gMax, soil moisture and shear strength. Each of the three reference points is dependent on the others in order to evaluate the overall safety and playability of the playing surface. Without all three reference points, you are in fact “lost” as they interdepend upon each other. If a surface is too hard in gMax numbers, you can lower the gMax number by adding moisture. However, with added moisture, traction and shear strength are reduced. If the shear strength is too low, that number can be increased by drying out the surface, however you increase gMax. This is why, similar to GPS readings, each number is dependent on the other for your overall ability to assess playability and safety of the surface.

Read the full article in the Spring 2025 issue of Alabama Turf Times – https://theturfzone.com/ata/?ascat=71&sub=issue&issue_id=9390&rti=true&rel=6