A new study reveals that combining biochar with beneficial soil bacteria can significantly improve phosphorus availability, reshape plant development, and increase crop yields in greenhouse-grown cherry tomatoes.
Phosphorus is an essential nutrient for plant growth, but much of it becomes locked in soil and unavailable to crops. This limits agricultural productivity and leads to excessive fertilizer use. Researchers have now demonstrated that a biochar-based microbial strategy can mobilize this “hidden” phosphorus and enhance plant performance in a sustainable way.
“Our findings show that pairing biochar with phosphate-solubilizing bacteria creates a powerful synergy in the soil,” said the study’s corresponding author. “This approach not only improves nutrient availability but also reshapes plant growth in ways that directly increase yield.”
The research team developed a biochar–Bacillus consortium by loading biochar with beneficial bacteria known for their ability to solubilize phosphorus. When applied to greenhouse soils, this combined treatment significantly enhanced soil phosphorus availability, microbial activity, and plant nutrient uptake.
Compared to untreated soil, the biochar–microbe system increased available phosphorus in the rhizosphere and boosted microbial biomass phosphorus by more than 170 percent. It also stimulated alkaline phosphatase activity, an important enzyme involved in releasing phosphorus from organic forms.
These soil-level changes translated into clear improvements in plant growth. The treated tomato plants developed stronger and more extensive root systems, with increases in root length, surface area, and branching. These traits are critical for nutrient acquisition and overall plant health.
The study also uncovered a striking effect on plant reproduction. The biochar–Bacillus treatment enhanced inflorescence architecture, increasing the proportion of productive fruit-bearing branches. While individual fruit weight slightly decreased, the number of fruits per plant rose substantially.
As a result, overall yield increased by more than 23 percent compared to conventional fertilization. This demonstrates that optimizing plant structure, rather than simply increasing fruit size, can be a highly effective strategy for boosting productivity.
The researchers found that these benefits were closely linked to changes in the soil microbial community. The biochar acted as a protective habitat for beneficial bacteria, allowing them to thrive and outcompete less favorable microbes. In particular, populations of Bacillus and other plant growth-promoting bacteria increased, while less beneficial groups declined.
“Our results highlight the importance of the soil microbiome in regulating nutrient cycling and plant development,” the authors noted. “By engineering these microbial communities with biochar as a carrier, we can enhance both soil function and crop performance.”
Importantly, the study suggests that this strategy could help address global challenges related to phosphorus sustainability. Phosphorus is a finite resource, and inefficient fertilizer use contributes to environmental pollution. By improving the efficiency of phosphorus use in soils, biochar–microbe systems offer a promising pathway toward more sustainable agriculture.
The researchers emphasize that this approach is particularly well suited for greenhouse and intensive farming systems, where nutrient imbalances and soil degradation are common.
“This work provides a practical and scalable solution for improving soil fertility and crop yield without increasing fertilizer inputs,” the authors said. “It represents a step forward in developing environmentally friendly technologies for modern agriculture.”
As global food demand continues to rise, innovations that enhance nutrient efficiency and crop productivity will be critical. The biochar–microbe partnership described in this study offers a compelling example of how nature-based solutions can help meet these challenges.
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Journal Reference: Liu, S., Shi, Y., Zhang, A. et al. Synergistic biochar‑ Bacillus consortium enhances phosphorus availability, root architecture, and inflorescence development in greenhouse cherry tomato. Biochar 8 , 66 (2026).
https://doi.org/10.1007/s42773-026-00586-z
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.
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Biochar
Experimental study
Synergistic biochar‑Bacillus consortium enhances phosphorus availability, root architecture, and inflorescence development in greenhouse cherry tomato
1-Mar-2026