Microbial inoculants for promoting water retention in kansas agricultural soils

Overview

This solution leverages Bacillus subtilis, a naturally occurring soil bacterium, as a microbial inoculant to improve water retention in agricultural soils. By producing biosurfactants that enable hydrophobic-hydrophilic transitions, the treatment reduces evaporation rates and increases soil water content by an average of 2-3% in loam soils. The technology addresses a critical challenge for agricultural producers in semi-arid regions like Kansas, where declining groundwater stores and frequent drought conditions demand sustainable approaches to soil moisture management.

The offering is supported by both experimental validation and a systems dynamics model that confirms economic feasibility, particularly for sandy loam soils prevalent in Kansas agricultural areas. This dual validation approach provides producers with confidence in both performance and return on investment.

Technical specifications

Key features:

• Bacillus subtilis inoculant produces biosurfactants (including Surfactin) that modify soil wettability and reduce evapotranspiration rates
• Demonstrated 2-3% average increase in soil water content in loam soil treatments
• Economically feasible for sandy loam soils in Kansas agricultural regions per systems dynamics modeling
• Inexpensive, rapid bacterial culture with potential for long-term function in soil environments
• Compatible with existing agricultural practices as a soil amendment

How it works:

The bacterium is applied to soil where it produces biosurfactants that facilitate hydrophobic-hydrophilic transitions in soil particles. This biological activity reduces evaporation rates and enhances the soil's capacity to retain moisture, ultimately decreasing irrigation requirements.

Technology readiness level

Lab-scale experiments have validated initial performance, demonstrating measurable increases in soil water content and reduced evaporation rates in treated loam and sandy loam soils. Future work will collect soil water characteristic curves (SWCC) to complement existing evaporation data and fully characterize hydraulic behavior across diverse Kansas soil types. Soil properties including texture, soluble salts, and organic matter will be analyzed at the KSU Soil Testing Lab to optimize treatment protocols. The technology is at an early-to-mid stage of development, with ongoing validation needed before commercial deployment.