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UoH Scientists Convert Geranium Leaves into Biochar to Boost Soil Health

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  Published in Science and Technology on Tuesday, November 25th 2025 at 22:16 GMT by The New Indian Express

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Turning Garden Scraps into Soil Gold: UoH Researchers Turn Geranium Waste into Biochar for Sustainable Agriculture

In a quiet laboratory at the University of Hyderabad (UoH), a team of soil scientists and environmental engineers are turning a common gardening nuisance into a powerful tool for sustainable farming. The story, highlighted in the latest edition of The New Indian Express, details how waste geranium leaves—an abundant by‑product of ornamental gardening in Telangana—are being converted into biochar, a form of charcoal that can dramatically improve soil health and carbon sequestration.

The Problem: Growing Waste from Greenery

Geraniums are a favorite in Indian homes and commercial flower markets, prized for their bright blooms and hardy nature. However, every year the disposal of spent leaves and stems generates thousands of tonnes of organic waste. In Telangana, where the climate and soil make geranium cultivation popular, this waste has become a significant environmental challenge. Conventional disposal methods—composting or landfilling—either take up valuable land space or risk releasing methane, a potent greenhouse gas.

The UoH research team, led by Dr. Ananya Rao of the Department of Soil Science, recognized that these leaves, rich in cellulose and lignin, could serve as an excellent feedstock for biochar production. Biochar, produced through pyrolysis (thermal decomposition in the absence of oxygen), is known to increase soil fertility, improve water retention, and lock carbon in the soil for centuries.

The Experiment: From Leaves to Soil

The researchers collected over 10,000 kg of geranium waste from local nurseries and botanical gardens. After drying the material to a moisture content below 15%, they fed it into a laboratory pyrolysis unit set at temperatures ranging from 300 °C to 550 °C. They tested three pyrolysis regimes to optimize the yield and quality of the resulting biochar.

Key findings:

• Optimal Temperature: Pyrolysis at 450 °C produced biochar with the highest surface area and porosity, essential for nutrient retention.
• Yield: Approximately 30 % of the dry weight of geranium leaves was converted into biochar, with the remainder becoming bio‑oil and syngas—both of which can be used as bioenergy sources.
• Carbon Content: The biochar contained 70–75 % carbon, surpassing many commercial biochar products.

Once produced, the biochar was ground to a fine powder and incorporated into test plots at varying rates (0 kg/ha, 2 000 kg/ha, and 4 000 kg/ha) alongside conventional wheat and paddy crops.

Soil Health Impacts

The field trials, conducted over two growing seasons in Hyderabad’s semi‑arid region, revealed striking improvements in soil quality:

These improvements translated into higher crop yields: wheat produced an average of 3 t/ha with 2 000 kg/ha biochar and 3.3 t/ha with 4 000 kg/ha, compared to 2.6 t/ha in the control plot. Paddy yields increased by 12 % under the higher biochar treatment.

Dr. Rao explained that the porous structure of biochar acts as a sponge, retaining moisture and nutrients, while its high pH moderates soil acidity—a common problem in Telangana’s alluvial soils. “We’re essentially turning a waste stream into a renewable soil amendment that also sequesters carbon,” she said.

Carbon Sequestration and Climate Benefits

Beyond yield benefits, the research underscores biochar’s role in mitigating climate change. The team used a life‑cycle assessment to estimate carbon sequestration. For every tonne of geranium waste processed, roughly 0.6 tonnes of CO₂ equivalent are sequestered in the soil over a 20‑year horizon. This is comparable to the annual emissions of a medium‑sized household.

In addition, the syngas and bio‑oil by‑products can be harnessed for local energy needs, reducing reliance on fossil fuels. The team is partnering with a regional bioenergy company to pilot a small‑scale combustion system that could power the greenhouse used for geranium cultivation.

Policy and Scaling Implications

The New Indian Express article notes that the state government’s recent “Zero‑Waste” initiative, launched in 2024, includes a target to divert 70 % of municipal solid waste from landfills. The UoH biochar project dovetails neatly with this policy, offering a scalable, low‑cost solution for ornamental plant waste.

“We’ve already secured a memorandum of understanding with the Telangana Department of Agriculture to deploy this technology across 20,000 hectares of smallholder farms,” said Dr. Rao. The plan involves training local farmers on biochar production and application, as well as establishing a supply chain for geranium waste collection.

Future Directions

While the early results are promising, the researchers are cautious about over‑promising. Further studies will focus on:

1. Long‑term Soil Effects: Monitoring biochar’s influence on soil health over 5–10 years.
2. Economic Viability: Conducting cost‑benefit analyses for smallholders, factoring in labor, equipment, and market prices for biochar.
3. Broader Feedstocks: Testing other horticultural wastes such as marigold and chrysanthemum leaves to broaden applicability.

The article also links to a recent UoH conference where Dr. Rao’s team presented their findings, inviting collaboration from environmental NGOs and the private sector.

A Win‑Win for Soil and Society

In a world where food security and climate resilience are increasingly intertwined, the UoH biochar project stands out as a practical, locally grounded innovation. By converting ornamental garden waste into a soil‑health enhancer, the researchers are offering farmers a way to increase yields, reduce chemical fertilizer use, and sequester carbon—all while tackling a persistent waste problem.

For Telangana’s many farmers, this could mean higher incomes and more resilient farms. For the planet, it could be another small but significant step toward a circular, sustainable future.