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Playing with numbers
Micah Woods
Chief Scientist | Asian Turfgrass Center
Handout: bit.ly/playing_numbers
www.asianturfgrass.com
Sustainable Turfgrass Management in Asia 2015
Pattaya, Thailand
9 March 2015
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But what is it good for?
The data are only useful
when they can be used as a
decision making tool.
•
Identify a target range.
•
Learn what affects green
speed, surface hardness,
and soil moisture.
•
Use data and that
knowledge to work more
efficiently and improve
playing conditions.
fine fescue
England
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Green speed, measured with a stimpmeter,
as ball roll distance in feet.
seashore paspalum
Thailand
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Modify the green speed by adjusting …
- the mowing height
- frequency of rolling
- N rate
- plant water status
- grass species
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Lightweight rolling is very effective in
increasing green speed.
fine fescue
Scotland
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Surface hardness, which I've measured
with a Clegg hammer as Gmax.
seashore paspalum
Vietnam
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Modify the green hardness by adjusting …
- soil organic matter
- soil moisture content
- sand topdressing
- scarification
- coring
- other types of cultivation
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Sand topdressing is an important practice
to control surface hardness.
bermudagrass
Thailand
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Volumetric water content measured with a
Theta-probe or TDR-300 in %.
bermudagrass
Singapore
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Modify the soil moisture by adjusting …
- irrigation
- soil organic matter / sand topdressing
- drainage
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When organic matter accumulates, soil
moisture can be high, with soft surfaces.
seashore paspalum
Hong Kong
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To get better control of soil water, manage
the accumulation of soil organic matter.
seashore paspalum
Hong Kong
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Performance data can be
used to improve playing
conditions and to prioritize
the maintenance work.
For more information, see:
bit.ly/playing_numbers
bermudagrass
New Delhi