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Alexander R. Kowalewski, Brian M. Schwartz, Austin L. Grimshaw, Dana G. Sullivan and Jason B. Peake

There has been extensive research to document the effects of various turfgrass physiological and morphological characteristics on wear tolerance of currently used varieties. Physiological characteristics associated with improved wear tolerance

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L.E. Trenholm, R.N. Carrow and R.R. Duncan

Damage from traffic can seriously injure athletic field turfgrass, although fertility regimes can influence wear tolerance. While excess nitrogen (N) can reduce wear tolerance, moderate N has improved tolerance and hastened recovery from injury. Potassium (K) may enhance wear tolerance through regulation of turgor potential. This research was undertaken to determine shoot growth and wear tolerance of seashore paspalum (Paspalum vaginatum Swartz) to N and K application. Field studies were conducted in 1998 at the Univ. of Georgia Experiment Station, Griffin. Grasses were established on U.S. Golf Association specification greens in 1996. Fertility treatments were applied at annual N rates of 196 and 392 kg·ha-1 and K rates of 92 and 392 kg·ha-1. The higher N rate increased wear tolerance, shoot growth, shoot density, visual quality, and color of the two ecotypes, AP 10 and AP 14, but reduced their visible range spectral reflectance, indicating greater absorption of photosynthetically active radiation (PAR). Measured responses to K were minimal and no enhancement of wear tolerance in response to K treatment was noted.

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Mark J. Carroll and A. Martin Petrovic

Nitrogen (96 and 192 kg·ha-1·year-1) and K (0, 48, 96, and 192 kg·ha-1·year-1) were applied in factorial combination over 4 years to two creeping bentgrass (Agrostis palustris Huds.) and one Kentucky bluegrass (Poa pratensis L.) field plot locations. Turfgrass wear tolerance and recovery from wear were evaluated in the 3rd and 4th years of N and K application by visually estimating the percentage of unworn turf present at the wheel track of a wear simulator or by determining the fresh weight of turfgrass tissue collected from cores removed within, and outside the simulator wheel track. Increasing the supply of N improved creeping bentgrass wear tolerance in the 4th year, but had no effect on Kentucky bluegrass wear tolerance. Nitrogen did not influence recovery from the wear of either species over 8 to 14 days of evaluation following the imposition of wear. Potassium did not affect the wear tolerance or recovery from wear injury in either species.

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Alexander R. Kowalewski, John N. Rogers III, James R. Crum and Jeffrey C. Dunne

system development, surface stability may be reduced. Therefore, developing an optimum topdressing regime capable of accumulating an adequate root zone layer, without being detrimental to turfgrass wear tolerance or surface stability, is critical. The

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Austin L. Grimshaw, Yuanshuo Qu, William A. Meyer, Eric Watkins and Stacy A. Bonos

have shown that fine fescues have the potential to perform well under wear in low-maintenance situations ( Cortese et al., 2011 ; Horgan et al., 2007 ; Watkins et al., 2010 ). In addition, considerable genetic variability in wear tolerance ( Bonos et

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Michael T. Deaton and David W. Williams

resisting compaction ( Xiong et al., 2006 ). This widely adopted method of construction allows for better drainage to increase the field use capacity. Increased capacity for field events on sand-based systems makes wear tolerance an important issue. Wear

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Lie-Bao Han, Gui-Long Song and Xunzhong Zhang

-season species ( Shearman and Beard, 1975a , b ). Among warm-season turfgrass species, japanese zoysiagrass and bermudagrass ( Cynodon dactylon ) are the species with more wear tolerance ( Turgeon, 2005 ). Among cool-season species, tall fescue, kentucky

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. These four distinct bermudagrass plants have potential to be released as new varieties if they demonstrate superior turf quality traits and adaptation over time. Hybrid Bemudagrass Morphology Predicts Wear Tolerance When developing new turfgrass

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J.T. Brosnan and J. Deputy

characteristics affect seashore paspalum wear tolerance. Trenholm et al. (1999 , 2000) evaluated seashore paspalum wear tolerance and reported that cultivars with a fine leaf texture, increased shoot density, and increased vertical growth rate exhibited wear

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David W. Williams, Paul B. Burrus and Kenneth L. Cropper

tolerance in turfgrass. The use of cultivars that exhibit higher wear tolerance is one important way of reducing wear stress. As with other traits, turfgrasses differ not only among species in wear tolerance but among cultivars as well. Samaranayake et al