D-ATR-FTIR Soil Nitrate Sensor for Precision Fertilizer Application
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Solution Overview
Problem
Current methods for determining soil nitrate levels in agricultural fields are inefficient, as they require labor-intensive soil sampling and analysis, lack real-time measurement capabilities, and have low spatial resolution, leading to suboptimal nitrogen fertilizer application and significant environmental and economic losses.
Innovation Solution
A field-deployable soil nitrate sensor system using Diamond-Attenuated Total Internal Reflectance-Fourier Transform Infrared (D-ATR-FTIR) spectroscopy that measures soil nitrate concentrations in real-time, integrated with a fertilizer applicator to enable precision nitrogen fertilizer application based on real-time data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional soil sampling and laboratory analysis methods are used to determine soil nitrate levels, then measurement accuracy is achieved, but labor intensity and time delay increase significantly
Solution Approach 1:
The patent replaces the mechanical/chemical laboratory analysis system with an optical detection system (NIRS or fluorescence spectroscopy). The sensor system uses electromagnetic radiation to directly measure soil nitrate levels in the field, eliminating the need for physical soil sampling, transportation, and laboratory processing. This substitution of measurement methodology achieves both accurate real-time detection and immediate data availability for fertilizer application decisions.
Solution Approach 2:
The patent introduces an optical intermediary (infrared light or fluorescence excitation light) that mediates between the soil nitrate and the detection system. The intermediary enables indirect measurement of nitrate concentrations through spectral characteristics or fluorescence signals, allowing rapid field-based quantification without direct chemical analysis. This intermediary approach maintains measurement accuracy while enabling real-time field operation.
2Measurement precision
If traditional soil sampling methods are used, then comprehensive soil analysis is achieved, but spatial resolution and productivity decrease
Solution Approach 1:
The sensor system enables continuous measurement of soil nitrate levels as the implement moves through the field. Unlike discrete soil sampling at specific locations, the optical sensor continuously scans and measures nitrate concentrations along the entire travel path, providing uninterrupted spatial data. This continuous measurement approach dramatically increases productivity by capturing comprehensive field variability without stopping for repeated sampling operations.
Solution Approach 2:
The patent replaces the mechanical soil sampling process (collecting, transporting, processing physical samples) with a non-contact optical measurement system. The sensor uses light or fluorescence signals to detect nitrate levels through or near the soil surface without physically disturbing or moving soil. This substitution eliminates the labor-intensive sampling workflow while maintaining detection capability and enabling rapid field-scale assessment.
3Ease of operation
If uniform nitrogen fertilizer application is used across the field, then simplicity of operation is maintained, but nitrogen use efficiency and environmental protection deteriorate
Solution Approach 1:
The patent applies local quality by varying nitrogen fertilizer application rates based on spatially-resolved soil nitrate measurements. Different zones within the field receive different fertilizer amounts according to their specific nitrate status and crop needs. The system integrates real-time sensor data with variable rate fertilizer application technology to deliver precisely the right amount of nitrogen to each location, improving overall nitrogen use efficiency while maintaining operational simplicity through automated control.
Solution Approach 2:
The system implements feedback control by using real-time soil nitrate measurements to automatically adjust fertilizer application rates. The sensor data feeds back to the fertilizer applicator controller, which modulates application quantities based on actual field conditions. This closed-loop feedback mechanism eliminates the need for manual intervention or complex planning, maintaining ease of operation while optimizing nitrogen distribution according to actual soil and crop needs.
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
The system reduces nitrogen fertilizer use by 5-20% without impacting corn yields, saving farmers money and minimizing environmental pollution by improving nitrogen use efficiency and reducing nitrate leaching into waterways.
Implementation Method 1
A field-deployable soil nitrate sensor system using Diamond-Attenuated Total Internal Reflectance-Fourier Transform Infrared (D-ATR-FTIR) spectroscopy
Implementation Method 2
Diamond-Attenuated Total Internal Reflectance-Fourier Transform Infrared (D-ATR-FTIR) spectroscopy that measures soil nitrate concentrations in real-time
Data Source
AI summary
An apparatus, method, and system for on-the-go soil nitrate level sensing, and optionally using the sensing to inform or instruct nitrogen fertilizer application across the field. In one form, the apparatus includes a soil sensing tool which carries a diamond ATR cell in combination with an FTIR field ruggedized spectrometer. The optical surface of the diamond ATR cell can be adjusted in pitch and depth to the soil. A processor is programmed to manipulate acquired spectra to derive a prediction of nitrate level for a given soil position in the field. This can be used to modulate a fertilizer applicator operation or coupled with georeference data collected simultaneously to generate a map of soil nitrate levels for the field, which can be used as a prescription for nitrogen fertilizer application.