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
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
3. Which data will we look at?
5. GSS kit, good performing turf
6. GSS sample locations, 2013 to 2016
7. Samples collected from good performing turf
8. How will we look at the data?
9. Ile aux Cerfs Golf Club, Mauritius
10. 87 92 86 81 87 83 86 91 86 84 82 84 86 88 90 92 18 hole score 10 random golf scores
11. 82 84 86 88 90 92 18 hole score Dotplot of 10 random golf scores
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
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
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
15. 74 76 78 80 82 84 86 88 90 92 94 96 18 hole score Dotplot of 100 random golf scores
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
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
19. Implications for pH, OM, K, P, Ca, Mg, etc.
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
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
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
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.
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
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
26. Soil K about 60 ppm
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
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
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
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
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
32. Micronutrient median values • Iron: 198 ppm • Manganese: 27 ppm • Zinc: 6 ppm • Copper: 3 ppm • Boron: 0.4 ppm
33. For more, please see www.asianturfgrass.com or @asianturfgrass on Twitter.