I've been working on an explanation of what OM246 testing is. The main point I wanted to make in part 1 is that the change in total organic matter between two measuring dates shows the result of topdressing, and growth, and weather, and microbial activity, and coring, and scarification, between those two dates.
This is an elaboration on, and an extension of, the calculations showing that hollow-tine cultivation, with removal of the cores, doesn’t reduce soil organic matter (OM) at all.
That’s not an intuitive result, because OM has obviously been removed from the rootzone.
Today I explained the same calculation about sand topdressing for the third time, so I need to write a blog post on this topic.
This is following the method of David Robinson, who says when you’ve written the same code 3 times, write a function; when you’ve given the same advice 3 times, write a blog post; and when you’ve done the blog post 3 times, write a book.
I watched the Greenkeeper App meeting about organic matter, and I recommend you do too. The video has Doug Soldat, Bill Kreuser, and Roch Gaussoin talking about soil organic matter, rootzones, sand topdressing, and turf performance.
Here are three reasons I think it is best to express sand topdressing applied to turfgrass as a depth.
Depth of sand standardizes the amount applied, independent of the mass of the sand or the area over which the sand was spread.
Cale Bigelow asked me an important question last month. I’d suggested that measuring the total organic matter over time is a way “to simultaneously produce a putting surface with the desired characteristics while minimizing the amount of disruptive work done to the putting surface.
What’s the trick? It is measuring the soil organic matter in the green, over time, and then adjusting the maintenance work. The purpose of this is to simultaneously produce a putting surface with the desired characteristics while minimizing the amount of disruptive work done to the putting surface.