The only thing that is critical to germination of mycorrhizal spores is the amount of plant available P as one of the phosphate forms the soil water. I'm sure Premier knows this because they produce mycorrhizal fungi. So I think they figured how many PPM's of available P is released from their fertilizer so it's not too high to inhibit mycorrhizal spore germination. We can't discern that from the
GUARANTEED MINIMUM ANALYSIS.
Well we can't discern much of anything relating to the sources of NPK, secondary nutrients or micros whether organic or inorganic.
