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Playing with numbers

Micah Woods
February 27, 2015

Playing with numbers

This presentation was given as part of the Sustainable Turfgrass Management in Asia 2015 conference at Pattaya, Thailand. The topic? Objective assessment of putting green surfaces.

What's the point of data collection? It shouldn't be just playing with numbers. One can collect reams of data about playing conditions. On their own, the data aren't useful. However, when considered in terms of how the current conditions compare to the desired conditions, and with an understanding of what maintenance work can be done to move the conditions closer to the desired ones, the data become quite useful.

Micah Woods

February 27, 2015

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  1. Playing with numbers
    Micah Woods
    Chief Scientist | Asian Turfgrass Center
    Handout: bit.ly/playing_numbers
    Sustainable Turfgrass Management in Asia 2015
    Pattaya, Thailand
    9 March 2015

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  5. 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

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  6. Green speed, measured with a stimpmeter,
    as ball roll distance in feet.
    seashore paspalum

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  9. Modify the green speed by adjusting …
    - the mowing height
    - frequency of rolling
    - N rate
    - plant water status
    - grass species

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  10. Lightweight rolling is very effective in
    increasing green speed.
    fine fescue

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  11. Surface hardness, which I've measured
    with a Clegg hammer as Gmax.
    seashore paspalum

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  14. Modify the green hardness by adjusting …
    - soil organic matter
    - soil moisture content
    - sand topdressing
    - scarification
    - coring
    - other types of cultivation

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  15. Sand topdressing is an important practice
    to control surface hardness.

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  16. Volumetric water content measured with a
    Theta-probe or TDR-300 in %.

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  19. Modify the soil moisture by adjusting …
    - irrigation
    - soil organic matter / sand topdressing
    - drainage

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  20. When organic matter accumulates, soil
    moisture can be high, with soft surfaces.
    seashore paspalum
    Hong Kong

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  21. To get better control of soil water, manage
    the accumulation of soil organic matter.
    seashore paspalum
    Hong Kong

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  23. Performance data can be
    used to improve playing
    conditions and to prioritize
    the maintenance work.
    For more information, see:
    New Delhi

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