We are at a frontier in soil science, with new discoveries being made all the time (ex. Rhyzophage).
The R-Soils Database is a project by Matt Powers. An open-source planetary soil database and community, where soil scientists and home gardeners alike will chart the mysteries of the soil.
This database will accept tests like soil respiration, brix, plant sap analysis, microscope images, and even dna sequencing. It will also utilize machine learning to assist in microbial identification and counting and, I'm sure, much more.
Ssussdriad will be a frequent participant in this community.