www.stma.org December 2016 | SportsTurf 49
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the importance of being able to adjust
the application frequency based on
GDD, to avoid the rebound growth
surge. Dr. Karl Danneberger recently
put together a TE application frequency
program for a talk he gave in Spokane,
WA. He plotted the GDD between
March 1 and September 30th and
showed that using the 200 GDD model,
17 applications of TE would be made
over that period. In the spring and the
fall intervals between applications were
between 13-27 days but those intervals
were much shorter in the hot summer
months (~ 8 days). By comparison,
29 applications of TE would be made
over that time period using a 7-day
application schedule.
While it is possible to determine and
track GDD yourself, based on a local
weather data, it's far easier to use an
online tool. Search the Internet to find
your local GDD tracker. Most will
allow you to type in your zip code and
it will tell you what the GDD is. The
Midwest region is served by the GDD
Tracker (GDDtracker.net) developed by
Michigan State University. MSU's GDD
tracker also has updates on weed and
insect problems. The GDD data will be
in degrees F and you will have to convert
to degrees C if you want to use the
model above.
In summary, my advice to you would
be to use the 250 GDD model with a
base of 0C as a starting point and then
build your own model around it, based
on local weather data and by measuring
field conditions that you think are most
important. Good luck!
Q&A WITH PAMELA SHERRATT
continued from page 50
SportsTurf magazine
DECEMBER 2016 Advertiser's Index
Advertiser . . . . . . . . Page#
Web Address
ABI Attachments. . . . . . . . . . . . . . . . . . . . . . . . 3
www.theabiforce.com
American Sports Builders Association. . . . . . 13
www.sportsbuilders.org
Barenbrug USA . . . . . . . . . . . . . . . . . . . . . . . 52
www.barusa.com
Beam Clay . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
www.beamclay.com
Campey Imants . . . . . . . . . . . . . . . . . . . . . . . 35
www.campeyimants.com
CoverSports USA . . . . . . . . . . . . . . . . . . . . . . 19
www.coversports.com
Ecolawn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
www.ecolawnapplicator.com
Game Time Sports Systems . . . . . . . . . . . . . . 48
www.gametimesportssystems.com
GreensGroomer . . . . . . . . . . . . . . . . . . . . . . . 51
www.greensgroomer.com
Hydraway Drainage Systems. . . . . . . . . . . . . 29
www.hydraway.net/stma
Midland-Smith Advertising . . . . . . . . . . . . . . 48
EasiSetBuildings.com
Mountain View Seeds. . . . . . . . . . . . . . . . . . . . 2
www.mtviewseeds.com
Redexim North America, Inc . . . . . . . . . . . . . . 5
www.redexim.com
SAFE Foundation . . . . . . . . . . . . . . . . . . . . . . 42
http://www.safefields.org
STMA Conference. . . . . . . . . . . . . . . . . . . . . . 17
www.stma.org
STMA Safe Foundation. . . . . . . . . . . . . . . . . . 38
http://www.safefields.org
TifSport Growers Association. . . . . . . . . . . . . 39
www.tifsport.com
Turf & Soil Diagnostics . . . . . . . . . . . . . . . . . . 48
www.turfdiag.com
The Turfgrass Group, Inc. . . . . . . . . . . . . . . . . 11
www.turfgrassgroup.com
TurfTime . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
www.turftime.com
World Class Athletic Surfaces . . . . . . . . . . . . 27
www.worldclasspaints.com
