Effects of Management Practices on Impact Absorption and Shear Resistance in Natural Turf

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Abstract
The Clegg impact soil tester (0.5 and 2.25-kg hammers), the Bruel & Kjaer 2515 vibration analyzer, and the Eijkelkamp Type 1B shear vane were used to evaluate effects of soil compaction, aeration, soil moisture, and thatch on impact absorption and shear resistance characteristics in several turfgrasses. Impact absorption characteristics were influenced most by soil moisture, soil compaction, and thatch. Peak deceleration decreased with increasing soil moisture and increased with compaction. Effects from aeration on peak deceleration were usually not significant; however, on several dates aeration significantly decreased the severity index and increased deformation. The presence of thatch on a surface improved shock attenuation under most conditions. Compaction increased shear resistance values. The effects on shear resistance from aeration and soil moisture were varied.

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