Research: Root Zone Mix Testing vs. Field Performance
The evaluation of root zone mixes for golf greens and athletic fields, in particular, has focused on comparing the test results to the USGA’s recommended specifications for particle size distribution and physical properties – even for athletic fields. The recommended specifications were first published in 1960 by Dr. Marvin Furgusen and based on research conducted under his auspices by H. Leon Howard. They have remained unchanged for the porosity ranges, and particle size distribution parameters. The infiltration rate minimum of 6 inches of water per hour has been retained, but the recommended ceiling has been removed.
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Bunkers
Root Zone:
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The purpose for testing root zone mixes is to determine whether they are appropriate for their intended purpose. Factors such as turf type, drainage, air movement, access to sunlight, water quality, and other environmental issues impact a root zone’s performance in the field. Its intended purpose and the amount of traffic also impact performance.
Robert Oppold, the COO of NML, is also ISTRC’s V.P. of Research & Development. He has been with ISTRC since 1994. The ISTRC SYSTEMTM was patented and introduced to the market in 1995. Mr. Oppold has evaluated thousands of undisturbed core samples and continues to write ISTRC reports in conjunction with his duties as NML’s principle technical officer. It is the interrelationship between the evaluation of individual materials and their maturation under field conditions that gives NML the data necessary to take materials evaluations beyond the USGA’s recommended specifications. His experience includes athletic fields, parks, common areas for Vegas casinos, as well as golf greens, tees, and fairways. Mr. Oppold began evaluating the micro-environment in 1995 and its impact on turf quality. The introduction of new densely populated bent and bermuda grasses in golf greens has improved playing conditions, but it has also impacted the evaluation of root zone mixes.