Greater statistical significance was noted, among
all ET levels at Logan, UT, however no Kentucky bluegrass performed at the acceptable lawn quality level for the season average, many falling below even the minimally acceptable quality score for low maintenance (5.0). Overall, tall fescues performed better with Tunderstruck, DLFPS-321/3679, LTP-SYN-A3 and RS4 in the top turf quality statistical group under the 40 percent ETo replacement (turf quality scores of 5.7, 5.5, 5.3 and 5.2 respectively). Less, but still some statistical significance was noted at the 60 percent ETo regime with no statistical differences seen in tall fescue mean turf quality scores at 80 percent ETo. In the first Fort Collins, CO, data, an interesting
and different effect from the ET regimes was noticed. Te perennial ryegrass control entry that is included in the trial was one of the lowest, or the lowest performing entry at each site, with the exception being Fort Collins. Under every ETo regime at Fort Collins, both for Kentucky bluegrass and tall fescue, the perennial ryegrass control entry was the top entry, in some cases statistically better than all entries. At the least, the perennial ryegrass entry was statistically better than most tall fescue and bluegrass entries. Besides the perennial ryegrass performance,
PST-K13-141 and PST-K11-118 Kentucky bluegrasses were consistently good at all three ETo levels. For tall fescue, PST-5SDS was the top entry under 40 percent ETo, while Catalyst, DLFPS-321/3678 and PST-R511 were also among the best performing entries under the three irrigation regimes. Te fifth reduced irrigation site, St. Paul, MN,
being much farther north than other sites, utilized a modified ETo schedule of 0, 25 and 75 percent replacement. Moderate statistical significance was noted under the three irrigation regimes, with tall fescue scoring higher overall than Kentucky bluegrass. Under the 0 percent and 25 percent regimes, no bluegrass entry finished with an acceptable lawn turf quality rating (6.0). Consistently rating near the top under all three levels include bluegrasses Blue Note, Blue Devil and PST-K3-141. Conversely, almost every tall fescue entry finished with an acceptable turf quality rating under all regimes at St. Paul. Some of the best tall fescues under each ET level include Nonet, DLFPS-321/3678 and PST-5SDS.
Other Species Other cool-season species, such as prairie
junegrass (Koeleria spp.), tufted hairgrass (Deschampsia cespitosa), rough bluegrass (Poa trivialis), supina bluegrass (Poa supina) and annual bluegrass (Poa annua) are potential sod products, although limited in their utility and geographical area of adaptation. Native species, such as junegrass and tufted
hairgrass, under low maintenance, can form a dense sward with an appearance somewhat like perennial ryegrass or
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Kentucky bluegrass. One tufted hairgrass cultivar has been tested by NTEP (1998 NTEP Fineleaf Fescue trial). Te other bluegrass species, rough, annual and supina, are still very much under development without a lot known about their performance characteristics and production needs. Other native species, such as inland saltgrass (Distichlis spicata) and poverty grass (Danthonia spicata), have special traits such as salt tolerance (inland saltgrass) or tolerance to infertile soils (poverty grass), but are probably several years away from commercialization.
WARM-SEASON In spring/summer 2013, new trials of
bermudagrass and zoysiagrass were established, with 35 entries in each trial. In addition, a unique new trial was established in conjunction with the United States Golf Association (USGA). Te trial evaluates bermudagrass (15 entries), zoysiagrass (11 entries) and seashore paspalum (2 entries) at eleven locations under putting green conditions. Te final summary of data from each of these
three warm-season trials is now available from NTEP. Even though each trial features a different set of data, a common theme of all these trials is data on initial establishment from 2013. However, due to the unusually harsh winter that many locations experienced in 2013/2014, several entries were never able to establish at some locations. Data on winter injury was collected and the cooperators were consulted on the condition of their trials. Since 2013-14 was the worst winter in more than thirty years, the decision was made by NTEP to replant several or all entries at the worst winter injury sites. NTEP has never replanted so many entries and locations in our history, but we felt it was necessary to give all entries an equal opportunity to establish and perform. No more replanting will take place for these three trials. Te information on the entries replanted at each location is noted on the data tables.
Bermudagrass Te 2013 bermuda NTEP trial contains eighteen
(18) seeded entries and seventeen (17) vegetative entries. Many of these entries are experimental cultivars or new commercial cultivars. NTEP evaluates warm-season grasses by comparing seeded and vegetative entries, and also by separately comparing seeded vs. seeded and vegetative vs. vegetative. Te final year of this trial was 2017. Terefore, we
now have several years of data that show the potential of new experimental entries. A final summary of data from 2013-2017 is available on the NTEP website. A new trial is being established in 2019, but for now, we will utilize data from the 2013 trial to discuss bermudagrass cultivar improvements.
TPI Turf News July/August 2019
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