Key Takeaways
- Yield Maintained with 25% Less Chemical Fertilizer: By adding a small amount of NBN, farmers can reduce their conventional nitrogen fertilizer use by 25% without suffering a loss in basmati rice yield.
- Rice Crop Yield Increased by 26.8% The optimal NBN treatment boosted rice yield by 26.8% compared to a reduced (75%) fertilizer dose.
- Soil Becomes a Better Water Tank: The nanobiochar made the soil 1.21 times better at holding moisture and improved aggregate stability by 12.2%, which is crucial for fighting drought.
- Better Roots for Better Nutrient Absorption: The healthy soil environment led to bigger and stronger roots, with root weight increasing by 24.6%, allowing the plant to absorb nutrients and water more efficiently.
- Sustainable Waste Recycling: The NBN is created from rice husk, turning an agricultural waste product into a valuable soil conditioner, supporting both crop productivity and ecological sustainability.
A recent study in the journal BiocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More by Aakash Kumar Saini and colleagues demonstrates a sustainable and highly effective approach to growing basmati rice: combining 75% of the recommended mineral nitrogen fertilizer (MF) with a specific dose of nitrogen-fortified nanobiochar (NBN). This combined approach significantly improved soil health and crop productivity, achieving yields statistically comparable to those obtained with 100% mineral fertilizer, while cutting chemical inputs by a quarter.
The research focused on overcoming the challenges of nutrient-deficient soils in basmati-growing areas and reducing the environmental toll of overusing synthetic nitrogen fertilizers. The innovation lies in NBN, a “smart delivery system” produced from agricultural waste (rice husk). Nanobiochar, with particles under 100 nm, possesses a massive surface area and porous structure, which allows it to excel at retaining nutrients and slowly releasing them to the crop. The most effective treatment, combining 75% mineral nitrogen and 5 kg ha−1 of NBN (N75NBN5), produced the highest grain yield of 31.33 g pot−1. Crucially, this yield was 26.8% higher than the 75% mineral-only treatment and statistically matched the conventional 100% mineral fertilizer treatment.
The yield increase was directly linked to the dramatic improvements in the rhizosphere soil and root system. Compared to the control treatment of 100% mineral nitrogen (N100), the optimal N75NBN5 application delivered substantial enhancements in soil health: Soil Chemistry Improved: Soil Organic Carbon (OC) increased by 1.22 times. Available nitrogen (Av N) was boosted by 1.03 times, while ammonium (NH4) and nitrate (NO3) content each increased by 1.06 times. This effect highlights NBN’s ability to adsorb mineral N, reducing leachingLeaching is the process where nutrients are dissolved and carried away from the soil by water. This can lead to nutrient depletion and environmental pollution. Biochar can help reduce leaching by improving nutrient retention in the soil. More and increasing its availability for plant uptake over time; Water Dynamics Enhanced: The soil became a much better reservoir for water, with Soil Moisture (SM) and Maximum Water-Holding Capacity (MWHC) increasing by 1.21 and 1.12 times, respectively, compared to the 100% MF treatment. This improvement is critical for drought resilience. Furthermore, Aggregate Stability (AS) increased by 12.2%, while the Infiltration Rate (IR) and Hydraulic Conductivity (Hc) increased by 1.36 times and 1.35 times, respectively; Roots Thrived: Healthier soil translated directly into a more robust root system. Compared to the 75% mineral-only treatment, root weight, length, and volume increased by 24.6%, 15.8%, and 18.7%, respectively. This improved development allowed for enhanced nutrient uptake, with nitrogen (N), phosphorus (P), and potassium (K) uptake all being statistically superior under the optimal NBN combination.
The study’s data confirmed a significant and positive correlation across the board, with grain yield showing a strong linear relationship with available N (R2=0.82), available P (R2=0.65), NH4 (R2=0.95), and NO3 (R2=0.95). This confirms that NBN, rich in carbon content, effectively enhanced the soil properties that directly fueled crop productivity.
By demonstrating that a 25% reduction in mineral fertilizer, when integrated with 5 kg ha−1 of NBN, can maintain or even surpass conventional yields, the research validates an ecological and economical pathway for rice production. This strategy offers a duel benefit: it manages agricultural waste (rice husk) by converting it into a valuable soil amendmentA soil amendment is any material added to the soil to enhance its physical or chemical properties, improving its suitability for plant growth. Biochar is considered a soil amendment as it can improve soil structure, water retention, nutrient availability, and microbial activity. More and mitigates the environmental impact of chemical fertilizers, paving the way for more sustainable and resilient farming practices.
Source: Saini, A. K., Abrol, V., Sharma, P., Srinivasarao, C., Parmar, A. S., Lado, M., Kumar, A., Kumar, M., Hashem, A., Almutairi, K. F., & Abd-Allah, E. F. (2025). Nitrogen-fortified nanobiochar impacts soil properties, root growth and basmati rice yield. Biochar, 7(1), 102.
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