AMF inoculation research for soil carbon sequestration and crop yield optimization

Overview

This research program investigates how resident arbuscular mycorrhizal fungi (AMF) communities shape the effectiveness of AMF inoculation in agricultural systems. The work addresses a critical knowledge gap: whether and how AMF inoculants improve crop yield depends on the existing soil fungal community and available niche space, which are themselves influenced by soil management practices such as compost amendments. By examining interactions between soil aggregation, nutrient stoichiometry, and AMF community composition, the research seeks to clarify the conditions under which inoculation enhances yield and contributes to soil carbon sequestration.

The findings will benefit agricultural innovators, soil health product developers, and sustainable farming operations seeking evidence-based strategies for leveraging microbial inoculants. Understanding how resident AMF communities mediate inoculation success can guide product development, inform field application protocols, and support claims around carbon sequestration potential.

Technical specifications

The research is structured around two complementary hypotheses:

• H1 focuses on how soil management affects resident AMF communities, which in turn determine whether AMF inoculation successfully establishes and increases crop yield.
• H2 examines how AMF community composition influences soil hyphal density, which governs the potential for AMF-mediated carbon translocation and sequestration.

Validation methodology:

• Field trials across 16 plots on four processing tomato farms in Yolo County, California, selected for differing compost amendment histories.
• Two inoculation treatments: a commercial AMF inoculant (Valent MycoApply Endo) and a water-only control.
• Measurements at 10 weeks post-inoculation including soil total carbon, inorganic and total nitrogen, plant-available phosphorus, AMF community structure in roots and bulk soil, and root colonization rates.
• End-of-season assessments covering soil aggregation, fruit yield and quality, biomass, hyphal density in soil, biologically active carbon (POX-C), and aggregate-associated carbon.

Technology readiness level

This is an early-stage applied research program at Technology Readiness Level 3–4. The work involves controlled field validation in commercial agricultural settings but has not yet produced a deployable product or service. The research aims to generate foundational knowledge about AMF inoculation effectiveness under different soil management regimes, with potential downstream applications in microbial product development, soil health assessment, and carbon farming practice design.