A new study finds that combining biochar with phosphate-solubilizing Bacillus bacteria improves phosphorus availability, boosts soil microbial activity, and increases greenhouse cherry tomato yields by more than 23%. The treatment enhanced root growth, nutrient uptake, and fruit-bearing branches while reducing reliance on fertilizer inputs, offering a scalable and sustainable solution for greenhouse production and phosphorus management.
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A new study shows that combining biochar with beneficial soil bacteria can significantly improve phosphorus availability, influence plant development, and boost yields in greenhouse-grown cherry tomatoes.
Phosphorus is vital for plant growth, yet much of it remains trapped in the soil in forms crops cannot easily use. This can reduce productivity and encourage heavier fertilizer use. The researchers found that a biochar-based microbial approach can unlock this “hidden” phosphorus, offering a more sustainable way to improve crop performance.
“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 researchers developed a biochar–Bacillus consortium by enriching biochar with beneficial bacteria capable of solubilizing phosphorus. When applied to greenhouse soils, this treatment significantly improved phosphorus availability, microbial activity, and plant nutrient uptake.
Compared with untreated soil, the biochar–microbe system increased available phosphorus in the rhizosphere and raised microbial biomass phosphorus by more than 170%. It also enhanced alkaline phosphatase activity, a key enzyme that helps release phosphorus from organic compounds, according to a press release.
These improvements in soil conditions led to clear gains in plant growth. Treated tomato plants developed larger and more robust root systems, with greater root length, surface area, and branching — traits that are essential for nutrient uptake and overall plant vigor.
The treatment also had a notable effect on reproduction. The biochar–Bacillus combination improved inflorescence architecture, increasing the share of productive, fruit-bearing branches. Although individual fruits were slightly smaller, the number of fruits per plant increased substantially.
Overall, yield rose by more than 23% compared with conventional fertilization. The findings suggest that improving plant architecture, rather than focusing only on fruit size, can be an effective way to increase productivity.
The researchers linked these benefits to shifts in the soil microbial community. Biochar provided a protective habitat for beneficial microbes, helping them establish and outcompete less favorable groups. Populations of Bacillus and other plant growth-promoting bacteria increased, while less beneficial microbes 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 this approach could help address broader challenges around phosphorus sustainability. Phosphorus is a finite resource, and inefficient fertilizer use can contribute to environmental pollution. By improving how efficiently soils supply and retain phosphorus, biochar–microbe systems could offer a more sustainable route for crop production.
The researchers note that this strategy may be especially valuable in greenhouse and other intensive farming systems, where nutrient imbalances and soil degradation are common concerns.
“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.”
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