Alginate-starch encapsulated rhizobacteria beads for enhanced plant growth and soil health
Microbial inoculant using plant growth promoting bacteria encapsulated in alginate-starch beads for stable storage and effective root colonization. Validated across wheat, ryegrass, blueberries, and trees with proven increases in soil health, enzyme activity, nutrient uptake, and biomass production.
Overview
This solution offers a microbial inoculant technology that encapsulates plant growth promoting rhizobacteria (PGPR) within alginate beads supplemented with starch. The formulation enables the production of dried beads with high bacterial cell concentrations that remain viable during storage and deliver effective colonization of plant root systems. Experimental results across wheat, ryegrass, blueberries, and tree crops have demonstrated increased soil health, enhanced enzyme activity, improved foliar nutrient uptake, and greater root and aerial biomass as well as fruit production.
Technical specifications
Key features:
- Encapsulation method: Rhizobacteria are immobilized by dripping an alginate-starch solution mixed with bacterial culture into a calcium-based gelling solution
- Optimized formulation: Maximum cell recovery achieved using trehalose as an osmoprotectant and calcium gluconate as the crosslinking agent
- Long shelf life: Dried beads retain 76% viable cells after one year of storage
- Scalable production: Prototype system capable of producing 2 kg of beads per hour
- Broad crop applicability: Validated on wheat, ryegrass, blueberries, and tree species under soil conditions
- Strain focus: Current work centers on Bacillus species for upcoming field validation
Technology readiness level
The technology has been validated in controlled soil experiments across multiple crop types, with statistically significant results (p≤0.05, three replicates). A bead production prototype operating at 2 kg per hour has been developed. The next stage involves field-scale validation on spring wheat (var. Pantera), planned for sowing in July and harvest in January, to confirm performance under real agricultural conditions and to monitor bacterial viability and root colonization in soil after inoculation.
About University of Concepción
University of Concepción is a comprehensive research university serving southern Chile through campuses in Concepción, Chillán, and Los Ángeles. Industry engages through a research and technology park that co‑locates companies with faculty groups, a business incubator that supports venture formation, and contract research units equipped for prototyping and validation. The university’s position in the Biobío region—Chile’s major logistics and manufacturing hub with direct access to deep‑water ports—enables efficient pilots, field trials, and supply‑chain collaboration. Research is supported by Chilean national research and innovation agencies and competitive international sponsors. A dedicated technology transfer office manages IP, licensing, and streamlined industry agreements, with established pathways for contract research and spinouts.
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