data from each state available on our website and CD. Hopefully, this makes the data more useful to growers within their geographical region or under their specific management level. NTEP recommends that growers first review data collected in their state or region and also under the management regime most suited to their needs. To find data for a specific state, go to:
www.ntep.org/states/states.htm.
NTEP Unveils Improved
Data Reporting Procedure NTEP is committed to improving its data
collection, analysis and reporting. To that end, NTEP spent ten years researching new statistical methods and is now implementing a new reporting procedure, the ’Location Performance Index’ or ‘LPI’, on its newest trials. Te LPI is based on ‘AMMI’, a more complete, accurate statistical analysis program for predicting cultivar performance across many locations. Te LPI is only used on turfgrass quality data but
in reading the turfgrass quality tables, you will notice that locations may not be grouped by any apparent geographical orientation. For instance, in the 2012 data from our new Kentucky bluegrass trial, ‘LPI Group 1' included Amherst, MA, W. Lafayette, IN, Urbana, IL, St. Paul, MN, Manhattan, KS, and Pullman, WA. It seems that these locations have nothing in common, geographically or climatically. However, what they do have in common is a very important similar ‘interaction pattern’, i.e. the varieties performed in a similar manner, relative to each other, at each of these locations in that year. For that reason and most appropriately, the LPI groups them together for analysis. And that ‘interaction pattern’ can, and very often will, vary from year to year. Terefore, investigate the LPI Group data containing locations that are closest to you, or your market. Te LPI is used on new trials as they are initiated.
Go to the NTEP website to read more about the LPI and the reasons for utilizing this new procedure.
Focus On Specific Traits NTEP is designing its trial programs such that
more data on specific traits are collected. For instance, standard trial locations, conducted at university sites using prescribed management schemes, collect traditional data, such as turfgrass quality, color, density, any diseases present, etc. NTEP also sponsors ancillary trial locations that collect data on specific traits, such as shade tolerance, traffic tolerance and sod strength. Tese ancillary trials must often be conducted in unique locations (i.e. under shade trees) or using specialized equipment (i.e. a traffic simulator). Because ancillary trials are applying unique stress to the entries, the data from these locations are often summarized and reported in separate tables. NTEP plans on conducting more of these ancillary
trials in the future and is in fact, co-sponsoring with TPI Turf News July/August 2019
A USGA/NTEP Cool-Season Water Use trial under a rainout shelter in Amherst, MA.
USGA, an entire trial just to evaluate cool-season and warm-season grasses for drought resistance and water use. Te cool-season water use trial was established in fall 2016, with ten locations initiating drought evaluations in summer 2017 or 2018. Te warm-season version of this trial was established in summer 2018, so look for data from both versions of this trial within the next few years. In addition, NTEP sponsored a low input trial for cool-season grasses and mixtures in fall 2015, while also establishing a warm- season low input trial in summer 2018. It is our hope that this type of data will provide much needed information to consumers on these important traits.
Update On Cultivars Te following is an overview of the latest information on commercially available and experimental cultivars.
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