Like a shutdown corner on the football field, mother nature is doing her thing for the next week or two here at Glen Echo. Below freezing temperatures and a few days of precipitation has moved us indoors to complete our course supplies refurbishing and other important duties before we get back out on the course.
Green Root Shearing
Once temperatures have moderated and all the snow and ice is gone from the course, the course will not reopen until the freeze has come completely out of the greens. I've attached a 1 minute video from the USGA regarding root shear and its effect on golf greens.
Shearing occurs when walking on thawed green surfaces and the root zone is frozen. Foot traffic on softening bentgrass greens causes the surface layer to shift with our weight and can tear roots at the junction of the thawed and frozen part of the green. The shearing off or tearing of roots that were 4-6" long to barely an inch or less causes the plant to use a tremendous amount of energy to regenerate the roots back to their mature length. Now remember that there are an average of
Keep in mind, all roots are continueing to grow and evolve during the spring season and into early summer. They are gaining root mass and extend top growth based on the supply of energy we provide. Once they've used all their energy for growth, there is usually excess energy that has no where to go so it is placed in storage to be used by the plant when production of energy does not keep up with demand. This generally occurs when soil temperatures reach around +85 and air temperature near +90 degrees during late June through early September..
Turf and Below Zero Temperatures
So will below zero weather have a negative effect on our turf? I'm glad you asked that question. Generally speaking our turf should be able to withstand these temperatures. Snow cover does provide some insulation but we only have about 1" or so covering our fairways and grens.
The turf most effected by below zero nights could be the bermuda grasss which we have invading almost all of our surfaces. It won't kill it completely but could potentially cause it to grow out from below ground. Normally bermuda begins to green up in its runners or stolons above ground. The freeze could force it to grow from rhizomes under ground because the runners on the surface on the ground could die back to below the surface. In most cases it will kill the plant completely but could delay its growth by weeks or more.
Our golf greens, cool season turf have a higher cold tolerance to severe cold. We did discontinue mowing to allow our greens to get a little fluffy. I was contemplating a mow in January but saw the long term outlook and decided to hold on until February. I'm glad I waited. Mowing in winter, especially if it is milder can signal the plants to grow which could lead to some cold temperature injury. Poa annua can be negatively effected by cold but I've never seen much winter kill in my 31 years in the business here in St. Louis.
Our zoysia grass tees, fairways have cold tolerance to about -5 to -10 degrees under normal circumstances. Without snow cover, north facing, shaded, and heavy traffiked areas could be subject to winter damage when temperatures fall into these ranges. This damage could result in slow green up and or death and in need for replacement.
Are there cultural practices which could reduce winter injury? Thank you for asking again and yes there are Best Practices that can assist in winter turf survival of zoysia grass. At Glen Echo, we do the following to improve our turf's chance for emerging unscathed in the spring.
- Aeration and or slicing fairways/tees in the summer
- Traffic control of carts and moving teeing grounds to reduce wear and tear. This is why we ask you to not drive directly from the teeing area to fairways because of wear and tear.
- Light, the more light the better which means the removal of limbs and or trees as necessary to improve and increase light. A minimum of 5-6 hours is the best. This would also include root pruning of trees using our tractor driven root pruner
- Ensure nitrogen fertilizer applications do not extend the growth of zoysia to far into the late summer/early fall which does not allow the zoysia to move into dormancy at the proper timing. Also provide adequate potassium to the zoysia through a late summer/fall which assists in winter hardiness
- Reduce drought stress going into dormancy
- Raise height of cut before season ends
- Reduce traffic during non-growth dormancy months
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Sometimes you get a bit greedy. 4 buckets of excellent flowing trees at the bottom of #3. |
- Additional soil to add as we pack it along and over the pipe
- Grading and shaping of the soil
- 4" drainage to be installed in front of 7 tee
- Sodding all areas disturbed
December/January Weather StatsDaytime highs in Decembr were nearly 5 degrees warmer with night temps slightly warmer. Inversely, nighttime temps in January were over 5 degrees higher than normal with daytime being slightly over. Overall, averages were about 3 degrees above for the two months.
DecemberTEMPERATURE (F) Observed Value Normal Depart Normal Last YearAVG. MAXIMUM 47.4 42.5 4.9 49.5
AVG. MINIMUM 28.8 26.9 1.9 30.0
MEAN 38.1 34.7 3.4 39.7
PRECIPITATION (INCHES)
TOTALS 1.60 2.84 -1.24 1.86
JanuaryTEMPERATURE (F) Observed Value Normal Depart Normal Last Year
AVG. MAXIMUM 40.9 39.9 1.0 42.5AVG. MINIMUM 29.0 23.7 5.3 28.8
MEAN 34.9 31.8 3.1 35.7
PRECIPITATION (INCHES)
TOTALS 3.82 2.40 1.42 6.49
