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Leaves of Grass: clipping volume from putting greens

C62291821dac0dd5b7ef3b72a30cd137?s=47 Micah Woods
February 21, 2018

Leaves of Grass: clipping volume from putting greens

These are the slides for my presentation on this topic at the 2018 Atlantic Golf Superintendents Association conference.

C62291821dac0dd5b7ef3b72a30cd137?s=128

Micah Woods

February 21, 2018
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Transcript

  1. Leaves of Grass: applications and implications of clipping volume Micah

    Woods February 21, 2018 Chief Scientist Asian Turfgrass Center www.asianturfgrass.com
  2. Clipping volume? 1. What’s this about?

  3. Clipping volume? 1. What’s this about? 2. How much time

    does it take?
  4. Clipping volume? 1. What’s this about? 2. How much time

    does it take? 3. What are these data used for?
  5. Clipping volume? 1. What’s this about? 2. How much time

    does it take? 3. What are these data used for? 4. What might these data be used for?
  6. What’s this about?

  7. None
  8. None
  9. None
  10. Two green system, Kanagawa

  11. Two green system, Kanagawa

  12. Two green system, Saitama

  13. Topdressing green, Saitama

  14. Rolling greens, Shiga

  15. Loading mower on kei-truck, Fukuoka

  16. Monthly course maintenance records, Okinawa

  17. Mowing greens, Fukuoka

  18. Course maintenance compound, Shizuoka

  19. None
  20. What’s affected by the growth rate? • playability • divot

    recovery • ball mark recovery • some diseases • traffic damage • green speed • mowing requirement • thatch (and everything associated with its management)
  21. Clipping volume, or clipping mass? Topdressing 1 green on 29

    May 2017, Keya GC, Fukuoka
  22. None
  23. Clipping collection research, Chiba

  24. 1 2 3 4 5 6 7 8 1 2

    3 4 5 6 7 8 9 Volume (L 100 m2) Dry weight (g m2) species bent champion korai Nichino Ryokka combined data 2015 & 2016
  25. Current best estimate: volume to mass For creeping bentgrass putting

    green clippings, I expect: 10 mL ≈ 0.6 g
  26. Current best estimate: volume to mass For creeping bentgrass putting

    green clippings, I expect: 10 mL ≈ 0.6 g
  27. How much time does it take?

  28. None
  29. What are these data used for?

  30. “Managing putting surfaces is, at its essence, about managing the

    growth rate of the turf … We’ve gathered daily growth rate data on the putting surfaces … This is all being done for the purpose of learning how to walk the razor’s edge of too much versus too little and ultimately optimize the quality of our putting surfaces.” Chris Tritabaugh in Optimize www.hazeltinenational.com/turf-blog/optimize
  31. Growth rate, and its variability • day to day •

    green to green • machine to machine • year to year
  32. None
  33. None
  34. None
  35. None
  36. KBC Augusta Tournament, 2013

  37. None
  38. None
  39. None
  40. None
  41. None
  42. None
  43. None
  44. None
  45. None
  46. None
  47. What might these data be used for?

  48. Other uses for the data • Fine tune nutrient supply

    based on harvest • When to mow again based on growth • Growth regulator effect • Topdressing requirement
  49. 0 40 80 120 1 2 3 4 5 6

    7 8 9 10 11 12 Month Monthly L/100 m2 year 2013 creeping bentgrass, 36° N
  50. 0 40 80 120 1 2 3 4 5 6

    7 8 9 10 11 12 Month Monthly L/100 m2 year 2013 2014 creeping bentgrass, 36° N
  51. 0 40 80 120 1 2 3 4 5 6

    7 8 9 10 11 12 Month Monthly L/100 m2 year 2013 2014 2015 creeping bentgrass, 36° N
  52. 0 40 80 120 1 2 3 4 5 6

    7 8 9 10 11 12 Month Monthly L/100 m2 year 2013 2014 2015 2016 creeping bentgrass, 36° N
  53. Table 1: Annual clipping volume at that location from 2013

    to 2016 Year Volume Estimated dry weight N applied L/100 m2 g/m2 lb/1000 ft2 2013 444 266 NA 2014 335 201 2.6 2015 287 172 2 2016 237 142 1.7
  54. Keya GC, August

  55. 2015 2016 2017 2014 2013 0 2 4 6 Jul

    31 Aug 07 Aug 14 Aug 21 Aug 28 liters per 100 m2 Morning clipping volume, 7 day moving average
  56. None
  57. For more, please see www.asianturfgrass.com or @asianturfgrass on Twitter.