Balancing the Books

Imagine two wheat fields: one rooted in dark brown, rich soils teeming with life and another in gray, compacted ground depleted by decades of intensive tillage and fertilizer use. Both may produce grain, but the health of the soil beneath them tells very different stories about the past – and the future – of our food systems.

These soil differences matter more than ever. Making crop production more resource efficient and environmentally sustainable hinges on transformative advances in precision agriculture and a deeper understanding of the biogeochemical processes that support soil health. Central to this effort is the management of carbon – the currency of energy in nature that cycles between the atmosphere, the soil, and all living organisms. We now face a soil carbon (C) dilemma in agriculture. On one hand, we aim to sequester atmospheric C and stabilize it as soil organic matter (SOM) below-ground to reduce greenhouse gas emissions; on the other, we rely on the breakdown of this same SOM to sustain crop growth. Tackling this dilemma requires a quantitative understanding of soil C dynamics and reliable tools to track them, enabling the development towards a climate-smart food system that nourishes and protects the planet.

As a FFAR Fellow at Colorado State University (CSU), my area of research focuses on soil health and investigating the driving factors of SOM dynamics below ground. Much like a banking system, SOM exists in both fast-cycling “checking” accounts – composed of partially decomposed plant and animal residues – and long-term “savings” accounts, where organic matter binds to minerals and persists over extended timescales. In this analogy, soil microbes act as the bank tellers, processing organic inputs through their enzymatic activity to convert nutrients into plant-available forms and driving the transformation of SOM. Despite decades of research, our understanding of how soil microbes influence SOM cycling remain limited. Gaining deeper mechanistic insight into how microbial activity and soil minerals interact to process organic C input will unlock new strategies to enhance SOM formation, and strengthen the quantitative models used to monitor and predict soil C dynamics – knowledge vital for sustainable and precision agriculture.

In the Soil Innovation Lab at Colorado State University, we use ¹³C and ¹⁵N isotope-enriched plant materials to trace the fate of plant-derived C across distinct SOM pools belowground. In my incubation experiment, I apply these labeled plant materials to soils with contrasting physicochemical properties (e.g., pH, texture, mineralogy). By sterilizing and inoculating these soils with microbial consortia that differ in their enzymatic traits, I aim to identify the hierarchy of biogeochemical factors that promote long-term soil C stabilization. To further understand the role of the soil microbiome in SOM dynamics, we will conduct genome sequencing at the end of the incubation to assess how the microbial community composition shifts under different treatment conditions. Together, these approaches will generate valuable insights for improving accurate soil C monitoring tools and support the development of a more sustainable, data-driven framework for precision agriculture.

The FFAR Fellows program has equipped me with the skills to translate insights from soil ecology and microbiology into actionable approaches for food sustainability research. The professional development and mentorship opportunities have strengthened my communication across disciplines and connect the scope of my research to real-world challenges. I am deeply grateful to the outstanding scientists and leaders in food and agriculture whom I have had the privilege to learn from through this program. I would also like to thank my sponsors – Ginkgo Bioworks and Oath Inc. – for supporting my fellowship and research, Dr. Francesca Cotrufo for her inspiring leadership in interdisciplinary science and her commitment to her students’ success, and my FFAR Fellows cohort for their continued encouragement and sense of community along the way.