Contrary to common belief, having a higher number of mycorrhizae species in a product does not translate to better results; in fact, it often yields the opposite outcome. A plant can sustain only one association with a particular mycorrhizal fungi species. Introducing multiple species creates competition among them, which is not advantageous for the plant. The initial colonizer does not ensure the highest success; instead, it gains precedence. It is recommended to select a product with a concentrated presence of a single mycorrhizae species known for its effective performance, rather than opting for a product with multiple species at lower concentrations.
The propagule count specified on most mycorrhizae products indicates the presence of spores (viable and unviable), hyphae, and root fragments. However, it is crucial to note that only viable spores, those with the capacity to germinate, can successfully colonize a plantās root system. Spores are to mycorrhizal fungi what seeds are to cannabis plantsāa fundamental component enabling fungi reproduction. Consequently, even if a mycorrhizal product boasts millions of propagules, its effectiveness hinges on the presence of viable spores. Without viable spores, the product will not contribute to plant development. Therefore, the genuine value of a mycorrhizal inoculant lies in the number of viable spores it contains, as only viable spores can efficiently initiate symbiosis.
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