Soil Microbe Restoration: A MetaGrow Vineyard Case Study

In a vineyard near Sacramento, we treated a block with MetaGrow, then sampled the soil in the treatment and adjacent control blocks two weeks later.

What it covers: A single-application MetaGrow trial in a vineyard near Sacramento, measured with metagenomic analysis of the treated block and an adjacent control.
Why it matters: Metagenomics identified species composition, populations and functions, showing how the soil microbiome changed within two weeks of one application.
Who it’s for: Vineyard and permanent crop growers, and anyone evaluating how quickly a microbial inoculant can change soil biology.

The trial

Location: A vineyard near Sacramento, California
Treatment: MetaGrow ST at 2 gallons per acre and MetaGrow MFOOD at 0.5 lb per acre
Applications: One
Sampling: Two weeks after application, in the treated block and the adjacent control block
Analysis: Metagenomics: species composition, populations and functions

With just one application, after two weeks the results were impressive.

194%Increase in the number of microbe species

520%Increase in phosphate-solubilizing microbes

93%Reduction in plant pathogen composition

Soil microbiome functions, treated block versus control
Function	Increase versus control
Number of microbe species	194%
Nitrogen-fixing microbes	290%
Phosphate-solubilizing microbes	520%
Successful colonization rate	73%
Siderophores (solubilizing and chelating Ca, K, Mg, Fe, Mn, Zn, Cu)	370%
Plant Growth Promoting Rhizome (PGPR)	150%
Plant growth factor producers	290%
SAR and ISR (plant immune system activators)	500+ ×
Chemical residue degraders	540 ×
Organic matter decomposers	140 ×
Plant pathogen composition	93% reduction
Anaerobic microbes	99% reduction

One application — MetaGrow ST at 2 gal/acre with MetaGrow MFOOD at 0.5 lb/acre — was measured just two weeks later.
The treated block showed a 194% increase in microbe species versus the adjacent control, with large gains in nitrogen-fixing (290%) and phosphate-solubilizing (520%) microbes.
Plant pathogen composition fell 93% and anaerobic microbes fell 99%.

Original SGS resource

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