Recovery Tips for Damaged Greens - Archived
Archived from 2015 for Reference
By John Garcia,
Chris Cowan,
and Scott Mackintosh M.S., CPAg
Mother
Nature strikes again! Unfortunately
there are an increasing number of
calls
and reports coming in of
winterkill on putting greens
throughout New England. Although there are certainly some concerns with ice encasement damage (anoxia), there are several others that never experienced any
significant ice, but still have damage. Those folks are
saying that they had 1-2” of
white, porous ice for 4-6 weeks, and as it has been removed and/or melted down, it
has exposed
“super saturated” , black looking turf
predominately on the poor draining pocketed
areas on their greens.
There have been lots of papers and reports written on the physiological
and
environmental reasons behind winterkill, and even some decent
broad-stroked
ideas on dealing with the aftermath/recovery. At this point however, it does not matter how or why, or if
something different could have been
done to avoid it. What
matters is returning surfaces to
playable conditions. This
short article is focused on specific thoughts, ideas, and methods to get your greens
back as quickly as possible.
Temperature
Cool season grasses such as poa
annua and creeping bentgrass begin to germinate at soil temperatures at 50 – 55F. In fact, the optimum temperature for cool season shoot growth is
59
- 75F and maximum root growth and tillering for
cool season grasses usually occurs
between 59 -
68
F. Maximum photosynthesis
ranges from 68- 78F with
a maximum of 87F
(1). So, if you are dealing with damage, the #1 mission is to get your
soil
temps up to facilitate recovery. This can be
expedited in a number of ways:
1) Aerate
with 3/8 or ½ inch solid
tines on the tightest spacing possible. No need
to
go deep, ¾”-1” is enough. The
goal
is to open the surface allowing the warmer spring air
and
sunshine to get into the primary root
zone/seedbed.
2) If possible
use
covers at night and on cold days
to
maintain the temperature
gains made during the day.
The Evergreen covers with the green
weave work great! Borrow covers from a neighbor if you don’t have
them/can’t afford them. Enka Mats are also a valuable tool for raising soil temps and aiding in germination.
3) If possible, spray pigmented products like TurfScreen Pure Pigment at the highest recommended
label rate. The
dark color will help to capture the warmth of the sun and raise surface temperatures faster.
4) Be sure to monitor soil temperatures in the rootzone and pay close attention for the potential of
fungal
pathogens. Granular Fungicide IX is a great product to use in these situations.
5) Soil moisture can
also impact soil
temperature in the spring. While
its important to maintain adequate moisture
for germination too much water can insulate the soil and slow the increase in
soil
temperature (4).
Aeration
You may need to roll greens prior to
the initial aeration,
as some greens tend to soften up over the winter. The last
thing you want to do is rut up the surfaces while trying to repair them. Avoid pulling cores and at least initially, the urge
to topdress. Although things may look bleak,
there may be more viable plants in your surfaces than
you think.
Dr Michelle Dacosta, of The University of Massachusetts
mentioned
at
a recent Seminar
that although a plant may shoot out green
leaves, it’s the bottom of the crown
that is the most vulnerable. If you are too abrasive with
the surfaces through removing cores, or dragging sand,
you
may be doing more harm than good. Keep aeration practices solid, shallow, and on the tightest spacing possible. The goal
is to warm the soils and provide a seedbed conducive to growth
and
recovery. Soil amending and thatch
reduction must wait!
Seed Selection
Although bentgrass won’t germinate until soil temps are in the 50’s, there is no reason to wait getting it out there. Seed
the weak areas early
and often. When choosing varieties remember, bentgrass is
a species. There are no cultivars that
will germinate faster than another…..regardless of what someone’s marketing piece might say. There are however,
statistical differences in post-germination establishment rate, spring greenup, and cold hardiness…..so, utilize the NTEPs and choose varieties that make the most sense for your
situation. Consider coated seed! Seed coated in a water-
retaining polymer (like Barenbrug’s Yellow Jacket), will give you the best chance of quick establishment. You may not
have your irrigation system charged early enough, and
even if you do,
the coating will
help to provide you an insurance
policy during the critical
establishment period. Extensive University research
shows more than a
10% improvement of germination and
establishment with coated seed vs. uncoated.
Fertility
In dealing with
cold weather/soil
grow-in situations, it’s important to recognize that you are dealing with a
compromised or
juvenile root system, and chemical
reactions that cannot take place quickly. In fact, the minimum soil temperature of
50 - 55F is considered necessary for sufficient mineralization activity to enhance release of N for plant use from organic
nitrogen
carriers. As soil temperature increases from 32 - 41F a very gradual
increase in nitrification occurs
(2). Therefore, apply liquid/soluble fertilizer in early April if you need to feed. Try and wait
until the soil temperature begins to climb to the upper 40”s before making a granular fertilizer application. Making a granular application in cooler soil temperatures
will not by utilized efficiently by the soil microbes or turfgrass plants.
The two most effective cold weather
Nitrogen sources
are Ammonium Sulfate, and Calcium Nitrate. We recommend utilizing Ca Nitrate
as it can be applied
as a granular or
sprayable product,
providing application flexibility. It is a 15.5-0-0 with 19% Ca. Calcium is a
vital
constituent of cell wall division,
and root hair growth, and therefore is the better option for this
situation. Light,
frequent applications
are
far more beneficial than large amounts in a
single application.
In fact, quick release N applied over ¾
lb may “shock” the plants, cause weak/succulent leaf
tissue, and be lost due to
runoff/leaching. Once
germination has
begun,
fertilize with .1-.2 lbs/1,000/N per week for the first 2-3 weeks. If you are spraying, consider a
fulvic or amino acid additive such as KaPre Exalt, Embella,
or Pennemin Perfect to help free up bound micro-nutrients and allow the
seedling access
to
the nutrients they need.
Establishment
Once you are happy with the percent germination,
supply a balanced, N-P-K granular fertilizer such as Ocean Organics
SeaBlend Super Starter 5-7-5 at a rate of
.75-1lb/N/1,000. IBDU is also a fantastic N source for early establishment in
the spring. Several studies have shown
better establishment with IBDU
than with urea or Ureaform (1). Avoid the temptation to make multiple,
“high-dose” granular applications with slow release Nitrogen
sources, as you may lose control once temperatures warm up. We have seen this
situation in the past, and
it becomes very difficult to improve
green speed once you lose control over the N release!
Play/Traffic
Clearly, the longer that traffic (from equipment and golfers) can be delayed, the better and faster the recovery will be.
Members and golfers will certainly want to be out there as the temperatures rise,
but
tempering expectations through frequent
communication and education will help everyone in
the long run. A few temporary greens
in April and May is a small
price to pay for outstanding conditions the rest of
the season. Last spring we witnessed the best recoveries
in our region when
greens were shut down until
late May. Closing to golfer traffic also takes pressure off of the
Superintendent
that might feel the need to mow or
roll
more often when the green is open.
Golfers have short
memories and will thank you
in June/July if caution
is used
early……A closed putting green WILL RECOVER
QUICKER if traffic is reduced!!
We are
here for you
Atlantic Golf
& Turf’s team of Professionals
has
the experience, the knowledge, and the resources
to
help you make the best decisions
possible as you work through this very difficult situation. We understand that each situation is unique, and we will always have your
best interest in mind when making agronomic recommendations. Good luck, and HAPPY
SPRING!
List of
References
1.
Beard, J.B. 1973.Turfgrass: Science and Culture.
Prentice-Hall, Englewood Cliffs, NJ.
2.
Carrow, Robert N. D.V. Paddington, P.E.Rieke. 2001. Turfgrass Soil Fertility and Chemical Problems: Assessment and
Management.
John Wiley & Sons Inc., Hoboken,
NJ.
3.
Mazur,
A.R., and C.B.WHite. 1983. Mineralization of N from several sources and
establishment of ‘Penncross’ creeping
bentgrass on putting green media.
Agron.
J. 75:977-982.
4.
Tisdale, S.L., W.L. Nelson,
J.D.
Beaton. 1985. Soil Fertility and Fertilizers. Macmillian Publishing Company, 866 Third
Avenue, New York, NY.
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