Tainio Biologicals Spectrum™ Soil Inoculant, 50 gram powder. Treats up to one acre. Spectrum™ Soil amendment contains a multiple species blend of plant growth promoting rhizobacteria (PGPR) and other beneficial plant growth promoting microorganisms (PGPs). This specially formulated soil inoculant enhances and restores beneficial soil microbe populations to augment the natural organic processes that occur in healthy soils. The beneficial soil-based microorganisms in Spectrum™ break down and release vital nutrients (such as phosphorus, nitrogen, calcium, iron, and more) stored in soil particles, making the nutrients more readily available to the plants in forms they can absorb. Plant growth promoting microorganisms produce organic acids and amino acids, which dissolve and make available (chelate) mineral nutrients. Apply directly to the ground or planting container and incorporate, pre-mix into potting soils or place the material into liquid suspension and apply as a drench or spray and incorporate. Approved for organic production. A mainstay of biological management. Ships by itself or can be combined with orders of rock dust and biochar for complete soil remineralization and carbon farming!