The firmness of putting greens varies with the surface organic material. More organic material in the top 2 cm (0.8 inches), and greens are softer. I discuss terminology, the relationship between firmness and organic material, and what you can do about this.

• The blog post discussed is https://www.asianturfgrass.com/post/om2-and-firmness/
• Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
• Find a suite of decision-making tools at https://www.paceturf.org/
• Get free ATC newsletters at https://www.asianturfgrass.com/newsletter/

Find out more about soil tests with ATC at https://www.asianturfgrass.com/project/soil-tests/

I've updated my recommendation for the sand quantity to apply for every unit of clipping volume harvested, if your goal is to keep surface organic material constant. Bjarni and I discussed topdressing by this method and the new equation that finds this sand amount.

• We discussed this post: https://www.asianturfgrass.com/post/sand-topdressing-ratios-clipping-volume/
• The PACE Turf table of sand rates based on surface organic material is at https://www.paceturf.org/public/sand-and-clipping-volume
• Bjarni and I discussed the spring green-up and growth from adding sand: https://www.asianturfgrass.com/post/turfgrass-mystery-the-case-of-the-greener-grass/
• Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
• Find a suite of decision-making tools at https://www.paceturf.org/
• Get free ATC newsletters at https://www.asianturfgrass.com/newsletter/

Find out more about soil tests with ATC at https://www.asianturfgrass.com/project/soil-tests/

This is about partitioning the growth flush after a rain. What's causing that growth flush? I made some calculations, using New Forest GC in the UK as an example. The increased soil water content from a 20 mm rain, in this example, would increase daily clipping volume from 10 mL/m2 to 22 mL/m2, a 12 mL increase.

• The blog post discussed is https://www.asianturfgrass.com/post/nitrogen-in-rain-or-nitrogen-from-the-soil/
• See also https://www.asianturfgrass.com/post/how-much-n-is-in-rain-and-snow/ for information on atmospheric deposition of N
• Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
• Find a suite of decision-making tools at https://www.paceturf.org/
• Get free ATC newsletters at https://www.asianturfgrass.com/newsletter/

Find out more about soil tests with ATC at https://www.asianturfgrass.com/project/soil-tests/