Effects of the Baldree Traffic Simulator On the Wear Tolerance of Four Bermudagrass Hybrids.

The Cady Traffic Simulator is a modified core cultivation unit capable of simulating three-directional dynamic force.� However, the cleated feet on the Cady were constructed using a looped truck tire, which lacks durability resulting in inconsistent wear and frequent repair.� Therefore, there is a need for a traffic simulator capable of creating dynamic force with improved durability.� It would also be advantageous to explore the effect of hybrid bermudagrass (Cynodon dactylon x C. transvalensis) morphological characteristics on wear tolerance.� The objectives of this research were to first, evaluate the bio-physiological effects of a novel traffic simulator, with improved durability, on a native soil turfgrass system. �Secondly, evaluate the wear tolerance of four hybrid bermudagrass genotypes.� This research was conducted at the University of Georgia Costal Plains Experiment Station, Tifton, GA.� Experimental design was a randomized complete strip-block design with three replications.� Factors included bermudagrass hybrids, weekly traffic rates and location.� Bermudagrass hybrids included �Tifway' and �TifSport', as well as two experimental varieties 04-76 and DT-1.� Simulated traffic was applied using the Baldree Traffic Simulator over a 6-week period, at rates of 4 passes per week, 2 passes per week and a control, which did not receive traffic.� The Baldree traffic simulator is a modified Ryan GA 30, with fabricated, spring loaded steel plate feet studded with screw in cleats.� Traffic was applied to location 1 from March 23 to April 27, 2012 and to location 2 from April 27 to June 1, 2012.� After six weeks of traffic, DT-1 had the greatest turfgrass density followed by Tifway, then TifSport, and finally 04-76.� Traffic applied once and twice weekly increased soil bulk density, but only the twice weekly application inhibited root recovery.� Initial dark green color index, leaf length, percent green cover and turf quality were correlated to turfgrass wear tolerance.