In the bold he is referring to AM fungi, a very special use case, not how microbes are applied in general use case.
Nope. There are very, very few known symbiotic microbes to cannabis; and even fewer "within" cannabis. In fact, the only organisms known to be symbiotic within cannabis are some species of AM fungi, but cannabis does not need AM fungi. Lots of microbes are synergistic to cannabis, not symbiotic.
Nope again, "mycorrizhae" isn't even a word, it's spelled "mycorrhizae"! And mycorrhizal fungi is a large group of various organisms, some are symbiotic to plants, others not. Most ectomycorrhizal fungi are not symbiotic to plants (truffles, etc, are an exception) but AM fungi (a type of endomycorrhizal fungi) is symbiotic to plants, however, they do not fix P. AM fungi will solubize P from organic matter and provide the P anions to the roots, they also provide N and other ions to the roots. Some microbes do fix N, like N2 (atmospheric N) fixing bacteria, but they don't fix N2 as N and then just give the N to plants, N2 fixing bacteria hold the N until it's released via. microbial loop. Also, "microbials" is not a word, lol, that's two words the "expert" author made up!
Plant do produce salicylic acid (SA) from biotic attack, but they also product jasomic acid (JA). There are many substances which are "SAR inducers", such as SA, JA, harpin protein, chitosan, etc. The autor is correct the SA is a SAR inducer (~100 ppm is good) and that the analog acetyl-SA (asprin) also induces SAR, *however*, SA reduces glandular trichome density and number! Thus you do not want to use SA to induce SAR. Jasomic acid, specifically methyl jasmonic acid, induces SAR and is proven to increase trich density and number in many plants. When JA is sprayed onto leafs it gets converted inside the leaf into two forms, one form, methyl jasmonic acid, is the form which induces greater trich destiny (per leaf area) and trich number (overall # of trichs).
