<x-tad-bigger>Glen and Leroy Creasy refer to research done on Mycorrhizae in their book "Grapes." They say the form of Mycorrhizae, VAM, acronym for vesicular-arbuscular mycorrhizae, are the most common form associated with grapes especially in low phosphorus soils. References are: Possingham and Groot Obbink, 1971; Deal et al. 1972; Biricolti et al 1997; Aguin et al 2004; so maybe it isn't all salesmanship. </x-tad-bigger>
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