Unlocking Biochar’s Potential

by Derek Ver Helst

A proven way to sequester carbon and a soil amendment showing benefit for farmers – it’s no wonder that biochar is gaining traction in sustainable agriculture conversations.

Terra Preta

As we seek new ways to mitigate atmospheric changes, biochar presents a promising proposition – especially in agriculture communities that can use it as a soil amendment to contribute to soil health. As the availability and accessibility of biochar has increased in recent years, many farmers have seen increased yields, coupled with a decreased need for synthetic inputs – all thanks to biochar applications.

While the use of biochar might be a new practice to US farms, it’s not a new practice globally. In fact, it dates back 2500 years, with origins in the Amazon rainforest. Indigenous people of the region burned forest debris and covered the burning biomass with soil. The resulting ‘man-made’ soil (referred to as Terra Preta) was found to be far more productive than any of the native soils.

We now understand that it offers many agronomic benefits for soil, including increased water infiltration and holding capacity, microbiome health, and nutrient content.

The Science of Biochar Carbon Capture

Biochar is the lightweight, black carbon residue produced via a process called pyrolysis. It is produced using the most abundant carbon sources on Earth as feedstocks: forest and crop residues, grasses, animal waste, and food waste. By heating these feedstocks to extreme temperatures in an environment without oxygen, the molecular bonds break, producing three different forms of carbon: stable carbon, ash, and volatile compounds.

The biochar carbon that is created in this process is indefinitely stable and can stay sequestered in the soil for hundreds to thousands of years. This makes it a valuable carbon sink – as the feedstocks absorb carbon as they grow, and the conversion to biochar prevents the emissions that would have been released as the natural wastes decomposed.

Due to its ability to enhance soil carbon sequestration, biochar presents great opportunities both for insetting and offsetting to meet sustainability commitments. The Science Based Targets Initiative (SBTi) has highlighted biochar in their new Forest, Land and Agriculture Science Based Target-Setting Guidance as a key insetting strategy for companies with land-based footprints to use in reaching their targets. Similarly, Verra has created a methodology for biochar to be used as an offsetting strategy due to the carbon storage associated with the production and use of biochar.

Improving Our Soils

Like most solutions within agriculture, biochar isn’t a one-size-fits-all solution. Instead, many factors determine the best types to use, as well as the optimum application techniques, rates, and timing.

Depending on the feedstock used and the temperature at which the biochar is produced, there is wide variety in the physiochemical composition of biochar – offering different benefits to soils. For example, a biochar produced from hazelnut shells will have a different physiochemical makeup than one made from ash tree sawdust. There are two main characteristics to consider, based on these physiochemical differences:

  • The porosity of biochar, which has the largest impact in how it reacts with water and nutrients in the soil profile. Internal structures in the feedstock such as the phloem and xylem define the porosity of the biochar it produces.
  • The amount of nutrients, which are determined by the chemical characteristics of the feedstock, along with oxidation/reduction reaction catalyst, pH buffering and CEC capabilities.

Learn More & Next Steps

For Farmers: USDA-NRCS has deployed new EQIP practice codes to encourage biochar use adoption (Codes 336/808 are referred to as the “Soil Carbon Amendment” practices). Read more from NRCS

For Companies: With its carbon sequestration potential, biochar can be an incredibly effective way to address Scope 3 emissions – either through credits or supporting its use in agriculture. Read this case study from Microsoft

Here at AgSpire, we are utilizing biochar in climate-smart commodity programs and look forward to incorporating the benefits of biochar more broadly. Contact us to learn more about how our advisory and implementation assistance services can help with your sustainability or land goals.

About the Author

Senior Conservation Agronomist

Derek has over 15 years of experience working with landowners and corporations to design, manage, and validate research trials, maximizing short- and long-term crop outputs. With a continued passion for conservation and the natural ecosystem, he is focused on the natural symbiosis organisms have with one another in the environment. Always eager to learn, he is continuously expanding his knowledge of soil health, chemistry, and pest disease management.

Derek holds a bachelor’s degree in Biology from South Dakota State University and a master’s degree in Agronomy from Iowa State University. He is also a Certified Crop Advisor.

Strengthening Your Sustainability Strategy

by Zach Pinto
Director, Carbon & Ecosystem Service Markets

In late 2015, many governments adopted the Paris Agreement – a legally binding, international treaty on greenhouse gas emissions. Since then, corporations and NGOS have joined governments to develop targets and strategies to limit environmental impacts. Now several years into the treaty, recent articles and analyses indicate that, collectively, we aren’t on track to make the changes needed.  

Sustainability Commitments 

To date, 341 food and agriculture companies have committed to and are engaging in science-based targets to advance sustainability and lower their environmental footprints. 

Within those commitments, targets around Scope 3 emissions offer the greatest opportunity for reductions and impact. Scope 3 emissions are environmental externalities that fall outside of a company’s direct control, typically within their upstream or downstream supply chains.  

For many food, feed, fuel, and fiber companies across the globe, reducing environmental impacts at the farm level is imperative for making progress toward these targets. 

Solutions within Agriculture 

Promising research shows that solutions exist within agriculture to accelerate progress and generate environmental benefit. From carbon sequestration, to improved water quality and usage, to enhanced biodiversity, these solutions can be scaled for positive global impacts.  

The good news is, much of the great work our industry is doing to inset its impacts – carbon programs, ecosystem markets, NRCS programs, USDA Partnerships for Climate Smart Commodities – can count as progress toward these targets. The key, of course, is making sure all of this work is measurable, verifiable, and scalable – and ensuring that the changes work for farmers and ranchers – both agronomically and economically.  

Here are three ways to strengthen your sustainability strategy and start unlocking the potential within agriculture:

  • Plan your strategy: Clarify what your supply shed looks like and outline your path forward. What are the most effective ways to drive change, measure progress, and reward farmers in the process? 
  • Partner with farmers: Farmers know how to farm, but adoption of regenerative practices is not a one-strategy-fits-all approach – cover crops don’t work for every farm, for example. Once you know where to focus, make sure you consult growers in the region to ensure you create interventions that work for their farm-specific conditions, make agronomic sense, and prove to be economically viable. 
  • Implement on the ground: Run pilots to test strategies and eventually scale them into full interventions. Ensure practices and outcomes align with leading public cost share programs and private ecosystem service markets that pay growers and count towards your targets.

Read more about how AgSpire can provide strategic guidance and implementation assistance to advance your sustainability goals: Our Services

Learn More

To showcase the great work going on in our industry, incentivize continuous improvement, and reward farmers for the positive practices they implement, many companies worldwide have set rigorous, protocol-based targets. These include:

  • Science-Based Targets: These targets define how quickly and by how much companies should reduce their environmental impacts, based on the best available science, to ensure that global goals such as the Paris Agreement or the Global Biodiversity Framework are met. Science-based targets for greenhouse gas emissions must be validated by the Science Based Targets Initiative (SBTi), and Science-based targets for water, land, and biodiversity must be validated by the Science Based Targets Network (SBTN).  
  • Net Zero Targets: Net Zero Targets are science-based targets that set the standard for how a company can credibly reduce their carbon footprint to net zero (when the amount of all greenhouse gases a company emits equals the amount it removes from the atmosphere) by 2050.

Additional Reading and Citations:

Soil Health and Carbon Sequestration in US Croplands: A Policy Analysis – https://food.berkeley.edu/wp-content/uploads/2016/05/GSPPCarbon_03052016_FINAL.pdf 

Cover Crops, No-Till Increase Carbon Gains in Soil – https://www.no-tillfarmer.com/articles/9818-cover-crops-no-till-increase-carbon-gains-in-soil

Negative Emissions Technologies and Reliable Sequestration – https://nap.nationalacademies.org/catalog/25259/negative-emissions-technologies-and-reliable-sequestration-a-research-agenda

About the Author

Director of Carbon & Ecosystem Service Markets

Zach promotes company strategy and client success by assisting industry groups, food and ag companies, and farmers on their sustainability goals. Zach has worked on carbon issues for stakeholders across the agriculture value chain and in a wide array of commodities, developing expertise in farm-level carbon accounting, MRV platform usage, voluntary and compliance market schemes, science-based targets, ESG reporting, and strategic planning.