
BIGGA's Continue to Learn, Harrogate 2025
January 2025
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See the Notes section below for even more ways to get information and updates from me.
Optimising turf: Growth, organic matter, and nutrients
- Presentation slides from this class conducted on 19 January 2025, in handout form (11.6 MB pdf file)
- OM246 calculator for sand rates
- One Bucket at a Time ebook about ClipVol
- Biofertilizers, soil conditioners, and biostimulants
Turf GvX: growth versus expected
- Presentation slides from this conference seminar on 21 January 2025, in handout form (2.9 MB pdf file)
- The Turf GvX posts on the ATC website
- The PACE Turf reference page on TurfGvX, with spreadsheets for ClipVol, GP, and TurfGvX calculation (for PACE Turf members)
- The Fusariummy productivity files page
- ATC blog post, What should my ClipVol be?
We had a short discussion about predicting the maximum quantity of clippings expected from a known quantity of N supplied to the grass. The Flipping things around blog post explains this. The calculation is simple.
First, divide the amount of N supplied by the N% of the leaves. See the PACE Turf update on Normal leaf nitrogen content for putting green grasses for current suggested values.
For example, let’s say we apply 1 g N/m2, and this is applied to creeping bentgrass with expected leaf N of 4.8%. The maximum quantity of clippings (dry mass) we could get from this is $\frac{1}{0.048} = 20.8$ g/m2. We expect 63 g of dried bentgrass clippings to have a fresh clipping volume of 1 L. Therefore, we can expect that our 1 g of added N can produce a maximum clipping volume of $\frac{20.8}{0.063} = 330$ mL/m2 of clipvol.
You can use the same math with a starting N rate in kg/ha. In that case, you’ll end up with clipping volume in units of L/ha, and you can divide by 10 to get the standard clipvol unit of L/1,000 m2 or mL/m2.
Sustainability in Golf: practical tips from around the world
- Presentation slides from Germinal’s Performance plus sustainability in golf event (6.5 MB pdf file)
- The article I recommend to set a framework for tangible things one can do: Documenting your progress toward sustainability
- Article by Hempfling et al. about action thresholds for fungicide applications that differ based on the dollar spot resistance of the bentgrass variety being grown Novel action thresholds of a logistic regression model to forecast dollar spot on bentgrasses
Notes
For more about ATC’s soil testing services, and example reports, see our soil tests page.
See more about OM246 testing, including sampling instructions and a sample report, at the OM246 project page.
For even more information, see: