I gave a detailed answer to 5 comments about this Office Hours episode (https://youtu.be/J5_5mDJ-Vxc) about OM246 testing. The blog post I discussed in this episode is: https://www.asianturfgrass.com/post/five-comments-about-atc-office-hours-om246/

I also talked about these blog posts on roots, and about potassium.

Roots: https://www.asianturfgrass.com/post/turf-roots-and-fertilizer/
Potassium deficiencies are not pretty: https://www.asianturfgrass.com/post/have-you-seen-turf-that-ran-out-of-k
Potassium deficiencies are a very bad thing: https://www.asianturfgrass.com/post/3-hours-mlsn-one-slide/
OM246 sampling instructions: https://www.asianturfgrass.com/project/om246/om246_sampling_instructions.pdf

Watch this episode on YouTube at https://youtu.be/bwZu86OIjx0