August 2018

SportsTurf provides current, practical and technical content on issues relevant to sports turf managers, including facilities managers. Most readers are athletic field managers from the professional level through parks and recreation, universities.

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www.spor 19 August 2018 // Humic Hapludult). This soil was selected due to its common use on high school athletic fi elds in Knoxville, TN. Study II used plots established on a sand meeting USGA specifi cations (0.7% very coarse, 14.3% coarse, 61.4% medium, 18.1% fi ne, 5.1% very fi ne, and 0.4% silt and clay by weight) mixed with 20% (volume) reed sedge peat moss. Study I had four soil moisture ranges: low (6 – 13%), medium (14 – 21 %), medium-high (22 – 29%), and high (30 - 37%). Study II soil moisture ranges were: low (5 – 11%), medium (12 – 19%), and high (20 – 27%) throughout the study for both years. Differences in the amount of ranges between rootzones were due to plant available water of the soil texture. Water was applied to each experimental unit as needed based on the average of seven rootzone moisture measurements (3 in depth) collected daily using a handheld time domain reflectometer (TDR) probe. Traffi c was applied to both studies using a self-propelled core aerifi er similar to the Baldree Traffi c Simulator (BTS) described by Kowalewski et al. (2013). Each plot received 50 traffic events each year. Silt loam rootzone THIS STUDY'S FINDINGS indicate that increased soil water content on cohesive soils resulted in greater loss of green turfgrass cover when traffi cked (Fig. 1). High soil water content ranges lost green turfgrass cover approximately four times faster than the low or medium soil water content and three times faster than medium-high soil water content treatments (Fig. 1). Surface hardness varied across traffi c events due to soil water content (Fig. 2). These fi ndings indicate surface hardness of a field can be manipulated by adjusting soil water content, suggesting that high soil moisture and soil compaction have signifi cant impacts on surface hardness values. Cohesive soils, due to the higher quantities of silt and clay, are more responsive to increases in water content. Regardless of soil water content, soil bulk density increased as traffi c events increased. The increase in soil bulk density was due to reduction of the air-fi lled pore space of soil. Shear strength declined most rapidly at the high soil water content treatment (Fig. 3). The high soil water content had the greatest loss of green turfgrass cover, extremely low surface hardness values and unacceptable shear strength throughout a majority of this study. This study found plots maintained Unmatched Sideline Turf Protection FieldSaver ® Features: • Durable-stands up to cleated football shoes • Breathable-allows water and air passage • Grommets at 3' intervals on all sides for stake down TuffPrint TM CUSTOMIZATION Blanket Style ArmorMesh Style Make your sideline look as good as the end zone. For price quotes, sizes, fabric specs and samples, visit • 800-445-6680 We make covers for all athletic surfaces: Rain Covers, Growth Covers, EnviroSafe Stadium Padding 2012 ACC Championship Game used FieldSaver ® Sideline Tarps from CoverSports ® ! Fig. 1a

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