Spectrum + Myco™ is a convenient combination of Spectrum™ and MycoGenesis™ in a single package. It's used as a biological soil inoculant for establishing populations of beneficial soil microbes. It is a critical component of AEA’s Soil Primer application. Spectrum + Myco™ is approved for use on certified organic crops and is listed by OMRI. 1 acre = 155 grams