Solid-State Soil Sensor for Continuous Nitrate Monitoring
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Solution Overview
Problem
Current methods for monitoring soil nitrate levels are time-consuming, expensive, and provide only snapshot data, failing to offer continuous and efficient measurement of soil nutrient concentrations, which can lead to late identification of undesirable soil chemistry compositions affecting plant health.
Innovation Solution
A solid-state soil nitrate sensor with a sensor blade featuring electrically insulating substrate, carbon or silver chloride electrodes, and solvent-cast polymer membranes for nitrate and reference sensing, allowing for in-situ, continuous monitoring of nitrate levels with improved robustness and reusability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If soil core sampling and lab testing methods are used to monitor nitrate levels, then measurement accuracy is achieved, but the process becomes time-consuming and expensive
Solution Approach 1:
The patent replaces the mechanical/chemical lab testing system with an electrochemical sensor system. The solid-state sensor uses electrochemical reactions at the electrode-membrane interface to directly measure nitrate concentration in soil solution, eliminating the need for time-consuming laboratory processing while maintaining measurement accuracy through selective membrane detection.
Solution Approach 2:
The sensor enables field-based autonomous measurement without requiring external laboratory infrastructure. The sensor blade inserted into soil performs self-contained electrochemical detection, with the membranes and electrodes working together to automatically generate voltage signals proportional to nitrate concentration, providing immediate results on-site.
2Measurement precision
If discrete location soil testing is performed, then specific nitrate level data is obtained, but continuous monitoring capability is lost
Solution Approach 1:
The sensor design enables continuous monitoring through persistent electrochemical detection. The solid-state construction with stable polymer membranes and durable electrodes allows the sensor to remain inserted in soil for extended periods, continuously measuring nitrate levels as concentrations change, rather than providing only discrete snapshot data from periodic sampling.
Solution Approach 2:
The sensor detects changes in electrochemical parameters (voltage potential) that correlate with nitrate concentration variations. By monitoring the electrical potential difference across the selective membranes over time, the system translates chemical concentration changes into continuous electrical signals that can be recorded and analyzed dynamically.
3Loss of information
If remote monitoring using cameras and spectrometers is implemented, then plant health assessment is possible, but early detection of soil chemistry issues is delayed
Solution Approach 1:
The sensor performs preliminary detection of nitrate concentration changes in the soil before these changes manifest as visible plant health problems. By continuously monitoring soil chemistry parameters directly at the root zone, the system identifies nutrient deficiencies or imbalances early, enabling corrective fertilization or management actions before plant tissue shows adverse symptoms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables real-time, continuous measurement of soil nutrients, enhancing fertilizer application efficiency by providing spatial and temporal monitoring of nutrient concentrations, thus preventing adverse soil chemistry issues before they affect plant health.
Implementation Method 1
a nitrate sensing membrane over the sensing region of the second electrode... The membrane will typically allow charge to flow through the membrane, but will prevent the transport of ions through the membrane
Implementation Method 2
The membrane will typically allow charge to flow through the membrane, but will prevent the transport of ions through the membrane
Implementation Method 3
Each electrode comprises a sensing region located towards an end of the sensor blade inserted into the soil... a reference membrane over the sensing region of the first electrode; and a nitrate sensing membrane over the sensing region of the second electrode
Data Source
AI summary
A solid-state soil nutrient sensor comprising a sensor blade for inserting into the soil, the sensor blade comprising an electrically insulating substrate. The sensor may further comprise first and second electrodes disposed on the substrate, each electrode comprising: a sensing region located towards an end of the sensor blade inserted into the soil, and a contact region displaced away from the end of the sensor blade and electrically connected to the sensing region, for making an electrical connection to the electrode. The sensor may further comprise electrical insulation over each of the first and second electrodes between the sensing region and the contact region; a reference membrane over the sensing region of the first electrode; and a nutrient sensing membrane over the sensing region of the second electrode; and the reference and nutrient sensing membrane each comprise one or more layers of solvent-cast polymer.