(Press-News.org) Researchers have developed a practical and low cost method to transform agricultural waste into high quality biochar, significantly increasing its ability to store carbon and help combat climate change. The study demonstrates that a simple treatment using limewater can dramatically improve the efficiency of biochar production while keeping the process accessible for use directly in the field.
Biochar is a carbon rich material produced when plant biomass is heated in low oxygen conditions. Because the carbon in biochar remains stable in soil for long periods, scientists consider it a promising carbon negative technology that can help remove carbon dioxide from the atmosphere. However, traditional biochar production typically requires specialized equipment and energy intensive processes, which limit large scale adoption.
In the new study, researchers explored a simple alternative inspired by natural burning processes. Instead of using industrial reactors, they combined open burning with a limewater treatment to improve carbon retention during the carbonization of orchard waste. The team tested this approach using pruned branches from Litchi trees, a common agricultural residue in southern China.
“Our goal was to develop a biochar production method that farmers could potentially use directly in orchards without expensive equipment,” said the study’s corresponding author. “By combining limewater treatment with a rapid water quenching process, we were able to significantly enhance carbon retention while maintaining a simple production method.”
The process works through a combination of chemical and physical mechanisms. Before burning, branches are immersed in limewater, allowing calcium compounds to penetrate and coat the biomass. When the branches are ignited, the outer layer burns quickly while the interior undergoes oxygen limited carbonization. The material is then rapidly quenched with water or limewater, preserving the carbonized structure and producing biochar.
The results showed that the limewater treatment dramatically improved performance. Biochar produced without treatment converted about 52 percent of the original biomass carbon into stable char. With limewater immersion and coating, the carbon conversion rate increased to approximately 86 percent.
The treated biochar also showed important improvements in structure and chemistry. It exhibited a much larger specific surface area and contained higher levels of oxygen containing functional groups, both of which are important for soil improvement and environmental applications. Microscopic and chemical analyses revealed that calcium compounds formed a protective barrier during combustion, helping prevent carbon from being oxidized into gases.
According to the researchers, the technique could have important implications for agricultural sustainability. Litchi orchards produce large amounts of pruned branches each year, which are often burned or discarded. Converting this biomass into biochar using the new method could turn a waste problem into a climate solution.
The study estimates that applying this strategy in Litchi orchards could sequester roughly 6000 kilograms of carbon per hectare, equivalent to about 22,000 kilograms of carbon dioxide. This amount could potentially offset a substantial portion of the carbon emissions associated with orchard cultivation.
“This approach shows how agricultural waste can be transformed into a valuable resource,” the researchers noted. “Local production and local use of biochar could help farmers reduce emissions while improving soil health and supporting more sustainable agricultural systems.”
The researchers believe the simplicity and scalability of the technique make it particularly promising for rural and developing regions where access to advanced biochar production facilities may be limited. With further development, this method could contribute to broader efforts to reduce agricultural emissions and enhance carbon sequestration worldwide.
===
Journal Reference: Xiao, L., Li, W., Wu, J. et al. Enhanced carbon retention in Litchi biochar via in-situ limewater coating and self-limited oxygen pyrolysis regulated by water-fire interaction. Biochar 8, 27 (2026).
https://doi.org/10.1007/s42773-025-00514-7
===
About Biochar
Biochar (e-ISSN: 2524-7867) is the first journal dedicated exclusively to biochar research, spanning agronomy, environmental science, and materials science. It publishes original studies on biochar production, processing, and applications—such as bioenergy, environmental remediation, soil enhancement, climate mitigation, water treatment, and sustainability analysis. The journal serves as an innovative and professional platform for global researchers to share advances in this rapidly expanding field.
Follow us on Facebook, X, and Bluesky.
END
Turning orchard waste into climate solutions: A simple method boosts biochar carbon storage
2026-03-09
ELSE PRESS RELEASES FROM THIS DATE:
New ACP papers say health care must be more accessible and inclusive for patients and physicians with disabilities
2026-03-09
New ACP papers say health care must be more accessible and inclusive for patients and physicians with disabilities
Abstract: https://www.acpjournals.org/doi/10.7326/ANNALS-25-04524
Abstract: https://www.acpjournals.org/doi/10.7326/ANNALS-25-04518
Editorial: https://www.acpjournals.org/doi/10.7326/ANNALS-25-05480
URL goes live when the embargo lifts
Two new papers from the American College of Physicians (ACP) address barriers to health care for people with disabilities and offer policy recommendations ...
Moisture powered materials could make cleaning CO₂ from air more efficient
2026-03-09
Over the past century, the amount of carbon dioxide in the atmosphere has increased dramatically. This rise has contributed to global warming and led to many harmful effects, including shifting weather patterns and more frequent droughts. There is an urgent need to lower the amount of carbon dioxide in the air to protect ecosystems and reduce future damage to the planet.
Paul V. Galvin professor Petra Fromme in ASU’s School of Molecular Sciences (SMS), and her team, have taken an important step toward improving technologies that pull carbon dioxide directly from the air—an approach considered ...
Scientists identify the gatekeeper of retinal progenitor cell identity
2026-03-09
Ikoma, Japan—The retina is a thin layer of neural tissue at the back of the eye that detects light and converts it into signals, sent to the brain. During development, all the specialized neurons in the retina—including photoreceptors and other cells essential for vision—arise from stem-like cells known as retinal progenitor cells (RPCs). Although RPCs can differentiate into multiple retinal cell types, this capacity is only temporary in mammals. As development proceeds, RPCs gradually lose their flexibility and ultimately transform into supporting cells called Müller glia (MG). Once this transition is complete, the retina ...
American Indian and Alaska native peoples experience higher rates of fatal police violence in and around reservations
2026-03-09
Indigenous people in the United States are at higher risk of fatal police violence in and around American Indian/Alaska Native (AIAN) reservations, according to the first comprehensive national study on the subject from researchers at Drexel University’s Dornsife School of Public Health and the University of Washington. The study, using data on the 203 AIAN people killed by police from 2013 through 2024, was published today in the journal PNAS. The authors hope this work will inform policy action to better protect these communities.
The ...
Research alert: Long-read genome sequencing uncovers new autism gene variants
2026-03-09
Researchers at the University of California San Diego have identified new genetic variants associated with autism spectrum disorder (ASD) by using long-read whole genome sequencing (LR-WGS), an emerging approach that reads large sections of the genome at once, making it easier for scientists to find new genetic variants and understand how genetic variants affect the function of a gene. The team found that compared to traditional short-read approaches, LR-WGS enhanced the discovery of several categories of genetic variants. The findings may pave ...
Genetic mapping of Baltic Sea herring important for sustainable fishing
2026-03-09
Herring from different parts of the Baltic Sea belong to distinct populations genetically adapted to local differences in salinity and temperature. However, these populations can also mix with each other, according to a new study by researchers from Uppsala University, Stockholm University and the Swedish University of Agricultural Sciences. These results have important implications for the management of the Baltic herring. The study is published in the Proceedings of the National Academy of Sciences.
Spring- and autumn-spawning herring in the Baltic Sea as well as in the Atlantic Ocean are genetically distinct. This is well known.
“Despite ...
In the ocean’s marine ‘snow,’ a scientist seeks clues to future climate
2026-03-09
As any diver knows, oceans can be cloudy places. Even on sunny days, snow-like particles drift through the water column, obscuring the aquatic world below.
Scientists have long known that this “marine snow” carries inorganic calcium carbonate – the building block of shells – but couldn’t explain how the mineral dissolves in the upper part of the ocean.
New research from Rutgers University-New Brunswick points to the culprit: bacteria.
“Think of marine particles as the megacities of the ocean,” said Benedict ...
Understanding how “marine snow” acts as a carbon sink
2026-03-09
In some parts of the deep ocean, it can look like it’s snowing. This “marine snow” is the dust and detritus that organisms slough off as they die and decompose. Marine snow can fall several kilometers to the deepest parts of the ocean, where the particles are buried in the seafloor for millennia.
Now, researchers at MIT and their collaborators have found that as marine snow falls, tiny hitchhikers may limit how deep the particles can sink before dissolving away. The team shows that when bacteria hitch a ride ...
In search of the room temperature superconductor: international team formulates research agenda
2026-03-09
The search for materials that can conduct electricity at room temperature without losing energy is one of the greatest and most consequential challenges of modern physics: loss-free power transmission, more efficient motors and generators, more powerful quantum computers, cheaper MRI devices. Hardly any other material discovery has the potential to change so many areas of technology and everyday life at the same time. An international research team with the participation of Christoph Heil from the Institute of Theoretical and Computational Physics at Graz University of Technology ...
Index provides flu risk for each state
2026-03-09
Infectious disease can afflict a population in complex ways. Understanding the varying risks is an equally complex challenge.
The Centers for Disease Control and Prevention (CDC) offers a general metric for assessing the risk of natural disasters in a region in terms of Social Vulnerability Index (SVI), which includes socioeconomic and cultural factors that impact how a region can adapt to a disaster. Researchers at Washington University in St. Louis wanted to take a more specific approach for assessing a state’s risk for influenza-like illness.
Their work, now published in the journal ...