What Is EC? How to Adjust EC Levels in Greenhouse Fertigation

ENGLISH CONTENT

Why Is EC So Important in Greenhouses?

In greenhouse cultivation, plants obtain most of their nutrients through irrigation water. For this reason, EC value, which indicates the concentration of dissolved salts and fertilizers in water, is a key parameter in plant nutrition management.

Incorrect EC levels can cause serious problems such as reduced yield, plant stress, and root damage. When EC is not properly controlled, plants either suffer from nutrient deficiency or experience salt accumulation in the root zone, both of which negatively affect growth.

What Are the Ideal EC Levels in Greenhouses?

Ideal EC values vary depending on the crop type and greenhouse conditions. Common reference ranges are as follows:

• Lettuce: 1.2 – 1.8 mS/cm

• Cucumber: 1.8 – 2.5 mS/cm

• Tomato: 2.0 – 3.0 mS/cm

• Pepper: 2.0 – 2.8 mS/cm

• Strawberry: 1.4 – 2.0 mS/cm

These values should be considered as general guidelines and adjusted according to water quality and climate conditions.

How Is EC Measured?

EC is measured using handheld EC meters, panel-mounted sensors, or probes integrated into automatic fertigation systems. For accurate measurement:

• EC should be measured during irrigation

• Fertilizer solution must be well mixed

• Lack of proper mixing may result in misleading EC readings

Regular and accurate EC measurement is essential for controlled greenhouse production.

How Is EC Adjusted in Greenhouses?

EC adjustments should always be made gradually. Sudden changes can cause plant stress and irreversible damage.

1. What Should Be Done If EC Is Too Low?

Low EC indicates insufficient nutrient availability for plants. In this case:

• Fertilizer dosage should be increased gradually

• Concentration in stock tanks should be checked

• Venturi injectors or dosing systems should be inspected

Sudden increases in EC may shock the plants.

2. What Should Be Done If EC Is Too High?

High EC leads to salt accumulation in the root zone and root burn. If EC is too high:

• Dilution with clean irrigation water should be applied

• Fertilizer injection should be reduced or temporarily stopped

• Irrigation lines should be flushed with clean water

Prolonged exposure to high EC can cause severe yield losses.

EC Control in Automatic Fertigation Systems

Automatic fertigation systems continuously monitor EC levels and adjust fertilizer injection accordingly. These systems:

• Minimize human error

• Maintain consistent nutrient balance during irrigation

• Improve production uniformity in large-scale greenhouses

An Important Note from the Field

EC alone is not sufficient. Even if EC levels are correct, improper pH values may prevent nutrient uptake. Therefore, EC and pH must always be managed together for optimal plant health.

Conclusion

Proper EC management ensures balanced nutrition, strong root development, and high crop yield. Fertigation without EC measurement relies on estimation and carries significant risk.

As Koçser Tarım

We provide turnkey solutions for greenhouse fertigation and EC–pH control systems, including site inspection, system design, installation, and commissioning. We help growers achieve precise and reliable EC management.