All-season plant health monitoring with low-cost electrochemical nutrient sensors

Overview

Excessive use of fertilizer and water in agriculture is unsustainable, yet ensuring adequate nutrient supply is essential to prevent pests and disease. This solution addresses that challenge through distributed networks of low-cost electrochemical sensors that continuously monitor nutrient levels throughout the growing season. By providing real-time data on key ions, the technology enables farmers to apply fertilizer and water precisely when and where needed, reducing waste, lowering costs, and limiting environmental impact.

The approach adapts proven ion-sensing technology from clinical diagnostics, where chemical sensors already perform billions of measurements per year. Recent advances in fouling resistance and calibration-free operation make it possible to deploy these sensors in the field with minimal maintenance and no specialized training.

Technical specifications

Core technology:

• Ion-selective electrodes with receptor-doped sensing membranes that detect specific nutrients in soil and water
• Nanoporous contacts that achieve ultra-low sensor drift below 10 microvolts per hour for long-term stability
• Hydrophobic redox buffers that reduce device-to-device variability to less than 1 mV, enabling calibration-free operation
• Covalently attached sensing membranes on polymeric substrates that prevent delamination and extend sensor lifetime

Target analytes for initial development:

• Potassium
• Ammonium
• Nitrate

Future expansion to include: chloride, phosphate, and calcium

Key advantages:

• Flat, printable sensor format compatible with mass manufacturing
• Resistance to chemical and biological fouling for reliable field operation
• Minimal calibration requirements suitable for end users without specialized training
• Scalable production at low cost

Technology readiness level

The underlying sensor technology has been extensively validated in laboratory settings, with demonstrated advances in drift reduction, device-to-device consistency, and membrane durability. Initial sensors for potassium, ammonium, and nitrate will undergo laboratory characterization for selectivity, sensitivity, and robustness under extreme stress conditions. Subsequent validation will occur in greenhouse and field environments in collaboration with an agricultural college. The research group has ongoing industry partnerships and welcomes additional collaborators to guide development toward commercial readiness.