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MLSN after 5 years: soil test interpretation for turfgrass today

MLSN after 5 years: soil test interpretation for turfgrass today

This presentation was given at the Philippine Golf Course Management Conference at Orchard Golf and Country Club. The minimum levels for sustainable nutrition (MLSN) guidelines for turfgrass soil test interpretation were introduced in 2012. In this presentation I explain why the MLSN guidelines were developed, how and why they work, and give a simple explanation of how the guidelines are used.

Micah Woods

May 03, 2017
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  1. MLSN after 5 years: soil test interpretation for
    turfgrass today
    Micah Woods
    4 May 2017
    Chief Scientist | Asian Turfgrass Center
    www.asianturfgrass.com

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  2. 1. Conventional guidelines are broken

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  3. 1. Conventional guidelines are broken
    2. The MLSN guidelines address these problems

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  4. 1. Conventional guidelines are broken
    2. The MLSN guidelines address these problems
    3. Using MLSN

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  5. Conventional guidelines are broken

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  6. Objective of greenkeeping
    The Old Course, St. Andrews

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  7. “Greenkeeping is managing the growth rate of
    the grass to create the desired playing surface
    for golf.” – Micah Woods

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  8. Short Grammar of Greenkeeping
    https://leanpub.com/short_grammar_of_greenkeeping

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  9. “The fundamental principle of successful
    greenkeeping is the recognition of the fact that
    the finest golfing grasses flourish on poor soil
    and that more harm is done by over-, rather
    than underfertilizing.” – Alister MacKenzie

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  10. Greenkeeping, or agronomy?

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  11. “In some cases, turfgrasses have been placed
    in a ‘high’ P and K requirement category, while
    pasture grasses were in a ‘low’ category. This
    decision was based on economics, not
    agronomics. The cost of fertilization was not
    considered of primary importance for turf.” –
    Carrow, Waddington, and Rieke

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  12. And grass is often grown in sand

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  13. “Turfgrass researchers continue to improve the
    soil testing recommendations, but that type of
    research is time consuming and expensive. It is
    also worth noting that every time a researcher
    conducts one of these studies, they tend to
    find that the levels required are lower than
    what we previously thought – meaning that
    ‘low potassium’ you got on your last soil test
    report might be optimum down the road.” –
    Doug Soldat

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  14. The MLSN guidelines address these
    problems

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  15. “I recommend you compare your results with
    PACE Turf’s Minimum Levels for Sustainable
    Nutrition [MLSN] guidelines ... the minimum
    levels published by PACE are drastically lower
    than many traditional soil test interpretations,
    and likely more accurate.” – Doug Soldat

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  16. The MLSN guidelines address these problems

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  17. Global Soil Survey

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  18. Soil samples from good-performing turf

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  19. Soil samples from good-performing turf

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  20. Let’s make sure we have enough apples

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  21. More specifically...
    One can express the quantity of an element required as
    fertilizer as Q.
    a + b − c = Q
    where,
    a is the quantity of the element used by the grass
    b is the quantity of the element kept in the soil
    c is the quantity of the element present in the soil
    Q is the quantity of the element required as fertilizer

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  22. MLSN is a value for b
    amount needed
    a + b −
    amount present
    c =
    fertilizer requirement
    Q
    a is a site-specific use estimate, b is the MLSN guideline, and c
    is the soil test result.

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  23. Recommended viewing
    Videoteca section at http://www.campusdelcesped.com/

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  24. http://www.blog.asianturfgrass.com/fertilizer/

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