What kind of soils produce the best turf today?

My presentation slides that summarize some results from the Global Soil Survey (GSS). This presentation was delivered at the XVI Congresso APG in Tavira. The GSS samples are from good-performing turf around the world. These soil conditions are representative of those producing good turf today.

Transcript

1. What kind of soils produce the best turf today?
   Micah Woods
   Chief Scientist
   Asian Turfgrass Center
   www.asianturfgrass.com
   November 8, 2017
   

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2. 1. Which data will we look at?
   2. How will we look at the data?
   3. Implications for pH, OM, K, P, Ca, Mg, salinity, micronutrients,
   and N
   

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3. Which data will we look at?
   

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4. View Slide

5. GSS kit, good performing turf
   

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6. GSS sample locations, 2013 to 2016
   

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7. Samples collected from good performing turf
   

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8. How will we look at the data?
   

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9. Ile aux Cerfs Golf Club, Mauritius
   

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10. 87 92
    86
    81
    87
    83 86
    91
    86
    84
    82 84 86 88 90 92
    18 hole score
    10 random golf scores
    

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11. 82 84 86 88 90 92
    18 hole score
    Dotplot of 10 random golf scores
    

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12. 0
    1
    2
    3
    80 82 84 86 88 90 92
    18 hole score
    count
    bin width = 1
    Histogram of 10 random golf scores
    

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13. 0
    1
    2
    3
    4
    5
    80 82 84 86 88 90 92 94
    18 hole score
    count
    bin width = 3
    Histogram of 10 random golf scores
    

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14. 87
    92
    86
    81
    87
    83
    86
    91
    86
    84
    88
    86
    81 84
    87
    86
    87
    80
    88
    81
    81 89
    87
    89
    75
    81
    86
    85
    87
    81
    90
    82
    83
    84
    87
    94
    84
    92
    81
    85
    88 93
    80
    83
    82
    81
    92
    85
    79
    89
    81
    83
    87
    80
    96
    79
    83
    82
    87
    84
    86
    82
    85
    89
    88
    87
    81
    76 86
    84
    91
    82
    84
    81
    74
    78
    84
    81
    83
    91
    88
    87
    91
    84
    86
    88
    83 87
    87
    87 86
    89
    81
    78
    82
    78
    91
    89
    90
    83
    74 76 78 80 82 84 86 88 90 92 94 96
    18 hole score
    100 random golf scores
    

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15. 74 76 78 80 82 84 86 88 90 92 94 96
    18 hole score
    Dotplot of 100 random golf scores
    

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16. 0
    5
    10
    74 76 78 80 82 84 86 88 90 92 94 96
    18 hole score
    count
    bin width = 1
    Histogram of 100 random golf scores
    

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17. 0
    10
    20
    30
    74 76 78 80 82 84 86 88 90 92 94 96 98
    18 hole score
    count
    bin width = 3
    Histogram of 100 random golf scores
    

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18. View Slide

19. Implications for pH, OM, K, P, Ca, Mg, etc.
    

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20. median: 6.5
    min: 4.6, max: 8.2
    0
    5
    10
    15
    20
    25
    5 6 7 8
    Soil pH in 1:1 H2O
    count
    pH
    

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21. median: 1.76
    min: 0.17, max: 10.15
    0
    5
    10
    15
    20
    0.0 2.5 5.0 7.5 10.0
    Soil organic ma er percent by weight
    count
    OM, all samples
    Loss on ignition at 360 C
    

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22. median: 1.44
    min: 0.17, max: 4.69
    0.0
    2.5
    5.0
    7.5
    10.0
    0 1 2 3 4
    Soil organic ma er percent by weight
    count
    OM, pu ing green samples
    Loss on ignition at 360 C
    

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23. Soil organic matter is about 5% N. From 1 to 4% of that N is
    expected to become plant available each year. That gives an
    estimate of about 20 kg N/ha expected release each year from the
    top 10 cm of soil for each 1% of soil organic matter.
    

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24. median: 60
    min: 10, max: 296
    0
    5
    10
    15
    20
    25
    0 100 200 300
    Soil K in ppm
    count
    Potassium
    Mehlich 3 extraction
    

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25. median: 60
    min: 10, max: 296
    86 percent below
    0
    5
    10
    15
    20
    25
    0 100 200 300
    Soil K in ppm
    count
    Potassium
    Mehlich 3 extraction
    

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26. Soil K about 60 ppm
    

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27. median: 68
    min: 6, max: 450
    38 percent below
    0
    10
    20
    30
    0 100 200 300 400
    Soil P in ppm
    count
    Phosphorus
    Mehlich 3 extraction
    

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28. median: 585.5
    min: 125, max: 2844
    58 percent below
    0
    5
    10
    15
    20
    0 1000 2000 3000
    Soil Ca in ppm
    count
    Calcium
    Mehlich 3 extraction, calcareous samples removed
    

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29. median: 74
    min: 23, max: 516
    79 percent below
    0
    10
    20
    30
    0 100 200 300 400 500
    Soil Mg in ppm
    count
    Magnesium
    Mehlich 3 extraction
    

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30. median: 0.66
    min: 0.5, max: 1.5
    100 percent below
    0
    10
    20
    30
    40
    0.0 0.5 1.0 1.5 2.0
    Soil salinity (EC) in dS/m
    count
    Soil salinity
    saturated paste equivalent from 1:2 soil:water
    

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31. median: 6.7
    min: 0, max: 26
    98 percent below
    0
    5
    10
    15
    20
    25
    0 10 20
    Nitrate + ammonium in ppm
    count
    Available nitrogen
    

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32. Micronutrient median values
    • Iron: 198 ppm
    • Manganese: 27 ppm
    • Zinc: 6 ppm
    • Copper: 3 ppm
    • Boron: 0.4 ppm
    

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33. For more, please see www.asianturfgrass.com or @asianturfgrass
    on Twitter.
    

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