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Turfgrasses are often exposed to different shade environments in con junc tion with traffic stresses (wear and/or compaction) in athletic fields within sta di ums. The objective of this study was to assess the effects of morning shade (AMS) and afternoon shade (PMS) alone and in combination with wear and wear plus soil compaction on 'Sea Isle 1∑ seashore paspalum (Paspalum vaginatum Swartz). The study was conducted using two con sec u tive field trials under sports field con di tions from 9 July to 10 Sept. 2001 at the Univ. of Georgia Experiment Sta tion at Griffin. "T" shaped struc tures constructed of plywood on the sports field were used to provide s 90% morning and afternoon shade, respec tive ly, and were in place for 1 year prior to data accumulation. A wear device and a studded roller device simulated turfgrass wear (WD) and wear plus soil compaction (WSC), respectively, to the shaded plots. Only minor differences in turf color, den si ty, or canopy spectral reflectance were found between AMS and PMS under no-traffic treat- ments in both trials. Grasses under WD generally re cov ered faster than those exposed to WSC across all light levels, including full sunlight (FL), AMS, and PMS. AMS combined with WD treatment had an average 9% higher rating of color, 11% higher density, and 28% less tissue injury than that of PMS with WD at 7 days after traffic treatment (DAT). Com pared to PMS with WSC treatment at 7 DAT, AMS with WSC had 12% higher rating of color, 9% higher density, and 4% less tissue injury. AMS with WD treatment ex hib it ed 11% higher normalized dif fer ence vegetation index (NDVI), 4% higher canopy water band index (CWBI), and 13% lower stress index than that of PMS with WD at 7 DAT. AMS with WSC, relative to PMS with WSC, dem on strat ed 8% higher NDVI, 3% high er CWBI, and 8% lower stress index at 7 DAT. Re sults indicated that AMS (i.e., afternoon sunlight) had less detrimental influences than PMS (i.e., morn ing sunlight) on turfgrass per for mance af ter it was sub ject ed to wear stress or wear plus soil com pac tion.

Effects of Morning and Afternoon Shade in Combination with Traffic Stress on Seashore Paspalum