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Turfgrass growth potential and measuring clippi...

Micah Woods
December 13, 2018

Turfgrass growth potential and measuring clipping volume

These slides were used to introduce and explain the magic of a temperature-based turfgrass growth potential. One can get a starting point estimate of turfgrass nutrient use by what seems like magic, starting with high and low daily air temperatures and ending up with, for example, a daily or weekly or monthly expected magnesium use by the grass. I then went on to explain that one can measure what actually does happen by measuring the clipping volume of the grass as it is mown.

Micah Woods

December 13, 2018
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  1. Turfgrass growth potential and measuring clipping volume Micah Woods 13

    December 2018 Chief Scientist Asian Turfgrass Center www.asianturfgrass.com
  2. Grasses can grow well when temperatures are close to an

    optimum for growth, and grasses grow more slowly as the temperature moves away from the optimum.
  3. 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
  4. Implications and use of GP • mowing frequency • fungicide

    duration • heat-related stress • topdressing requirement • nutrient use
  5. Use of clipping volume 1. Growth rate 2. Green speed

    3. Nutrient use and supply 4. Consistency
  6. Use of clipping volume 1. Growth rate 2. Green speed

    3. Nutrient use and supply 4. Consistency 5. Topdressing
  7. Then resupply as desired For example, 200 mL/m2 of bentgrass

    ≈ 0.5 g N/m2. And 0.25 g K/m2. And so on.
  8. “41% of members and players complain that sanded greens play

    poorly, according to turf managers who participated in recent GCI research.” GCI Magazine—April 2018
  9. Table 1: Annual clipping volume at that location from 2013

    to 2016 Year Volume Estimated dry weight N applied L/m2 g/m2 g/m2 2013 4.4 266 NA 2014 3.4 201 13 2015 2.9 172 10 2016 2.4 142 8.5