Sustainability
Soil Organic Matter Matters
Learn how managing "the living, the dead, and the very dead" components of your soil drives water retention, lowers CI scores, and builds a more resilient farm.
Learn how managing "the living, the dead, and the very dead" components of your soil drives water retention, lowers CI scores, and builds a more resilient farm.
Throughout history, many agricultural practices have focused on “mining” the soil for resources to drive immediate yield. When resources ran low, we supplemented with additional fertility to keep production high. While this approach has been successful in the short term, the industry is shifting. As we begin to understand the full cycle of nutrient cycling and the long-term sustainability of our land, we are uncovering a critical truth: we must grow our reserves within the soil just as diligently as we grow the crops above it.
SOM is the vital link between agronomic success and improved sustainable production—a link that leads directly to a reduced carbon footprint.
SOM isn’t just a buzzword; it is a functional engine within your crop cycle. To understand how to manage it, we must break it down into its three primary components:
The synergy between these three pools transforms the physical and chemical nature of your soil, specifically improving water retention, nutrient cycling, and structure.
Improved Water Holding Capacity
Think of your soil as a sponge. The ability of soil to retain moisture while maintaining porosity for air exchange is a major driver of crop success. While soil type (sand vs. clay) sets the baseline, increasing your SOM "upgrades" your sponge.
For every 1% increase in SOM, your soil can hold approximately 20,000 additional gallons of water per acre. This provides a massive buffer against drought and supports the microbial populations necessary for a healthy growing environment.
(https://www.nrcs.usda.gov/sites/default/files/2022-10/Soil-Health-Starter-Kit-reduced.pdf)
Nutrient Cycling and the "Magnet Effect"
You cannot discuss SOM without considering Cation Exchange Capacity (CEC). SOM effectively increases your soil's CEC, acting like a magnet that holds onto essential nutrients. By increasing SOM, you reduce nutrient runoff and leaching—particularly for nutrients like Potassium and Calcium that are easily lost in low-CEC environments.
Soil Structure and "Glue"
SOM acts as a biological glue (specifically a protein called glomalin) that creates soil aggregates. These "clumps" allow the soil to stay together while maintaining macro- and micro-pores. This structure facilitates the exchange of gases and water, reduces erosion, and provides "breathability" for the roots.
Caring for your soil is just as vital as caring for your cash crop. To build your "savings account," consider these two primary management shifts:
1. Reduced Tillage
Aggressive tillage passes "over-oxygenate" the soil, physically destroying soil aggregates and the microbial "houses" within them. This sudden influx of oxygen causes a metabolic frenzy among aerobic microbes, leading them to quickly consume organic matter and release it into the atmosphere as carbon dioxide. By reducing tillage, you "keep the lid on the stove," allowing carbon to remain in the ground.
2. Cover Crops
Keeping a living root in the ground year-round is the most effective way to pump carbon into the soil. Cover crops provide "food" for microbes through root exudates and leftover biomass. As these plants decompose, they leave behind channels that improve soil aeration and water infiltration, effectively "feeding" the nutrient cycle for the following cash crop.
Beyond the clear agronomic benefits, increasing your SOM is a very effective way to lower your Carbon Intensity (CI) score.
CI scores are a comprehensive look at your production footprint: tillage depth, cover crop usage, fertility rates, chemical applications, and fuel consumption. Because high-SOM soil is more efficient, it creates a "domino effect" of score reductions:
Ultimately, Soil Organic Matter is more than a biological metric—it is a financial one. By focusing on the "savings account" in your fields, you aren't just farming for today’s yield; you are building a more resilient, low-carbon operation for the future. However, in the modern supply chain, these agronomic gains only provide value if they are documented. Measurement is the final step in the data revolution, ensuring that every 1% increase in SOM is captured, quantified, and credited toward your farm’s success. At Gradable, we help you bridge that gap, turning your underground investments into transparent, marketable assets.
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