Chapter 18

Fertigation Systems for Vineyards

Electric Metering (EC/pH) Fertigation Injector

In-line injection electric metering (EC/pH controlled) injectors, also known as automated or computerized proportional fertigation systems, are also used for fertigation. These systems monitor electrical conductivity (EC) and pH levels in irrigation water, and inject concentrated fertilizers and pH adjusters to precisely control nutrient solutions for plants. These systems utilize sensors to measure the water’s properties and control dosing pumps to inject chemicals, thereby creating a closed-loop system that maintains optimal nutrient levels for plant growth in both hydroponic and soil-based agriculture.

Key Components and Functionality

The pumps (e.g., peristaltic, diaphragm) are electrically operated and controlled by a computer or controller. Unlike non-electric, water-pressure-driven proportional injectors (like basic Dosmatic or Dosatron units), electric pumps can be dynamically adjusted by the control system to achieve specific EC and pH targets. In-line probes continuously monitor the EC (total dissolved salts/nutrient concentration) and pH of the water solution. A central control unit (often with a touchscreen interface) receives data from the sensors and operates the metering pumps.

Advantages/Disadvantages of Electric Metering Fertigation Injectors

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