Soil EC Sensor for Fertigation Salt Accumulation Control
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Solution Overview
Problem
Prior art fertigation systems face challenges such as over-fertilization leading to groundwater pollution and high costs associated with computer-controlled systems, particularly in determining salts accumulation in soils, which affects crop productivity in greenhouse cultivation.
Innovation Solution
A fertigation system with a salts accumulation determination method using a soil EC sensor and a fertigation control server that allows for easy introduction and high-level control, employing a simplified and accurate method to determine salts accumulation by measuring electrical conductivity changes with reference culture solutions and carbohydrate injections, and a cost-effective EC sensor design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a computer-controlled system is introduced for fertigation, then control precision and ability to respond to weather changes is improved, but system cost and complexity increases significantly
Solution Approach 1:
The patent introduces a simple EC sensor as an intermediary device that bridges the gap between traditional timer-based systems and complex computer-controlled systems. The sensor provides direct electrical conductivity measurements of soil solution, enabling precise fertigation control without requiring complex computing infrastructure. The sensor output can be integrated with simple controllers or timers, maintaining system simplicity while achieving high measurement precision.
2Measurement precision
If traditional EC measurement methods are used, then salts accumulation can be detected, but measurement accuracy is insufficient due to interference from soil particles and variable moisture content
Solution Approach 1:
The patent extracts the measurement function from the complex soil environment by using a sensor design that measures electrical conductivity in the immediate vicinity of the probe tip. The measurement is taken in the soil solution layer directly surrounding the sensor, effectively separating the measurement from interfering factors such as soil particles, air gaps, and bulk moisture content variations. This extraction approach enables reliable EC measurement that directly reflects salts accumulation.
Solution Approach 2:
The patent changes the measurement parameter from bulk soil electrical conductivity to localized soil solution electrical conductivity. By measuring EC in the immediate vicinity of the sensor tip rather than in the bulk soil, the system detects changes in ion concentration that directly indicate salts accumulation. This parameter change transforms the measurement from being influenced by multiple factors to being a direct indicator of fertilizer salt buildup.
3Device complexity
If simplified timer-based fertigation systems are used, then system cost is reduced, but ability to respond to weather changes and prevent over-fertilization is lost
Solution Approach 1:
The patent implements a feedback mechanism where EC sensor measurements are continuously monitored and used to adjust fertigation timing and dosage. The sensor provides real-time information about soil solution conductivity, which feeds back to the control system to determine when fertilization is needed and how much fertilizer to apply. This feedback loop enables simple timer-based systems to achieve high fertigation efficiency by responding to actual soil conditions rather than following fixed schedules.
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 precise determination of salts accumulation, reducing the risk of over-fertilization, improving crop productivity, and lowering the economic burden on farming families by providing a cost-effective and user-friendly solution for monitoring soil conditions.
Implementation Method 1
employing a simplified and accurate method to determine salts accumulation by measuring electrical conductivity changes
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3A~3C
AI summary
A fertigation system comprises: a controller that transmits sensor data to a fertigation control server, and that controls a water supply valve, a culture stock solution supply valve, and a discharge valve on the basis of received data; and a fertigation control server that, on the basis of the sensor data received from the controller, calculates control amounts for the water supply valve, the culture stock solution supply valve, and the discharge valve, and returns the control amounts to the controller.