Micah Woods
December 02, 2019
500

# Applying the Grammar of Greenkeeping

I discussed, in a seminar held at Copenhagen Golf Club, the principles described in my book A Short Grammar of Greenkeeping: https://leanpub.com/short_grammar_of_greenkeeping

## Micah Woods

December 02, 2019

## Transcript

1. ### Applying the Grammar of Greenkeeping Micah Woods Chief Scientist Asian

Turfgrass Center www.asianturfgrass.com 2 December 2019

9. ### Some chapters … ▶ Defining turfgrass management ▶ Two uncontrollable

factors ▶ Water ▶ Air ▶ Soil organic matter ▶ Roots

15. ### Greenkeeping is managing the growth rate of the grass to

create the desired playing surface for golf.

21. ### What affects growth? Growth is a function of photosynthetic light,

plant water status, temperature, and a nutrient index.1 This can be represented as the environmental productivity index (EPI). 1Each of these factors can be represented by an index that takes a value from 0 to 1. Thus, the EPI will also have a value in the range of 0 to 1. The nutrient index is primarily a function of leaf N content.
22. ### What affects growth? Growth is a function of photosynthetic light,

plant water status, temperature, and a nutrient index.1 This can be represented as the environmental productivity index (EPI). (light)(water)(temperature)(nutrient) = EPI 1Each of these factors can be represented by an index that takes a value from 0 to 1. Thus, the EPI will also have a value in the range of 0 to 1. The nutrient index is primarily a function of leaf N content.

25. ### Light — 3 terms 1. PAR – photosynthetically active radiation

2. PPFD – photosynthetic photon flux density, measured per second 3. DLI – daily light integral, sum of PPFD from sunrise to sunset

EPI
29. ### Temperature-based growth potential PACE Turf developed the temperature-based GP to

express the actual temperature in terms of its proximity to optimum temperatures for shoot growth. GP = e−0.5(t−to var )2 where, GP = growth potential, on a scale of 0 to 1 e = 2.71828, a mathematical constant t = average temperature for a location, in celsius to = optimum temperature, 20 for C3 grass, 31 for C4 grass var = adjusts the change in GP as temperature moves away from to ; I suggest 5.5 for C3 and 7 for C4
30. ### Implications and use of GP ▶ mowing frequency ▶ fungicide

duration ▶ heat-related stress ▶ topdressing requirement ▶ nutrient use

34. ### The best playing surface will be produced when the soil

has just enough water to keep the grass from wilting, and the remaining soil volume will be filled with air.

38. ### Recommend records of … Key performance indicators ▶ Green speed

▶ Clipping volume Cultural inputs & conditions ▶ Nitrogen applications ▶ Sand topdressing applications ▶ Growth regulator applications ▶ Daily high & low temperature ▶ Daily precipitation Surface maintenance practices ▶ Mowing height ▶ Mowing frequency ▶ Vertical mowing ▶ Grooming ▶ Brushing ▶ Rolling

48. ### 4 things to increase roots on putting greens 1. Mow

the grass as high as possible
49. ### 4 things to increase roots on putting greens 1. Mow

the grass as high as possible 2. Apply the right amount of N, at the right time
50. ### 4 things to increase roots on putting greens 1. Mow

the grass as high as possible 2. Apply the right amount of N, at the right time 3. Make sure there is plenty of air in the soil
51. ### 4 things to increase roots on putting greens 1. Mow

the grass as high as possible 2. Apply the right amount of N, at the right time 3. Make sure there is plenty of air in the soil 4. Make sure there is enough P in the soil