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| Most likely, he has fairly compacted soils, and the microbes aren't able to live in the rootzone, or the plant is absorbing them as fast as it can make them. He probably lost more money in carbon, then he gained in yields. But with his compacted soil, he is better off looking at lime to boost the pH.
" It is known that potassium solubilizing bacteria (KSB) can solubilize K-bearing minerals a nd convert the insoluble K to soluble forms of K available to plant uptake. Many bacteria such as Acidothiobacillus ferrooxidans, Paenibacillus spp., Bacillus mucilaginosus, B. edaphicus, and B. circulans have capacity to solubilize K minerals (e.g., biotite, feldspar, illite, muscovite, orthoclase, and mica). KSB are usually present in all soils, although their number, diversity and ability for K solubilization vary depending upon the soil and climatic conditions. KSB can dissolve silicate minerals and release K through the production of organic and inorganic acids, acidolyhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC10213388/sis, polysaccharides, complexolysis, chelation, and exchange reactions. Hence, the production and management of biological fertilizers containing KSB can be an effective alternative to chemical fertilizers."
https://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-951620...
"Phosphate solubilizing microorganisms (PSMs) are bacteria or fungi that are capable of breaking down insoluble forms of phosphorus, such as phosphates, in the soil and making it available to plants as a soluble form that can be easily absorbed (Figure 1) (Rawat et al., 2020). They are huge category of beneficial microbe including many genera for in stance Bacillus spp., Pseudomonas spp., Streptomyces spp., Aspergillus spp., Rhizobium spp. Fusarium spp., Trichoderma spp., Penicillium spp., Serratia spp., Micrococcus spp., Stenotrophomonas spp., Acinetobacter spp., and Agrobacterium spp. (RodrÃguez and Fraga, 1999)"
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10213388/
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Stratification
