Mark, there is a lot of scientific evidence that supports your experience that Actinovate stimulates plant growth. Although not all Actinobacteria produce the same antifungal and antibacterial metabolites that Streptomyces lydicus WYEC 108 does, it seems they may all produce the plant growth promoting metabolites indole-3-acetic acid, ACC deaminase and also siderophores which are iron chelating compounds that can be taken up in plant roots.
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