In situ soil microbial activity monitoring via gas flux sensing

Overview

The proposed in situ soil microbial activity monitoring system offers a novel approach to quantify microbial activity by continuously measuring soil respiration in field conditions. The system utilizes a gas-permeable probe to collect soil air, which is then analyzed above ground using a non-dispersive infrared (NDIR) sensor for CO₂ measurement. Additionally, optional volatile organic compounds (VOC) sensing can provide microbial fingerprinting. The system operates on automated cycles, with data transmitted via IoT to generate a microbial activity index, aiding in real-time decision-making for agricultural management.

Technical specifications

• Gas-permeable probe: Prevents water and particle ingress while allowing effective soil air collection.
• NDIR sensor: Measures CO₂ flux, providing a proxy for microbial activity.
• Optional VOC sensing: Enhances capability for microbial fingerprinting.
• Environmental sensors integration: Temperature, moisture, and pH sensors can be added to improve data interpretation and predictive models.
• Automated cycles and IoT connectivity: Facilitates continuous monitoring and data transmission for scalable deployment.

Technology readiness level

The technology is currently at TRL 3, indicating it has been validated in a laboratory setting. The development will proceed through four phases to refine the system, test under controlled and field conditions, and ultimately deliver a robust, field-ready prototype.