Hydroponics

pH affects how plants absorb nutrients from the water. If the pH becomes too high or too low, plants may struggle to take in essential nutrients, even when they are present in the solution. This can lead to slower growth, reduced crop quality and lower yields.

For commercial growers, poor pH control can ultimately impact profitability through reduced output and increased production costs.

Most hydroponic systems operate within a slightly acidic pH range, making regular monitoring essential for maintaining healthy, productive crops.

Conductivity measures the concentration of dissolved nutrients in a hydroponic solution. It is commonly measured as EC (electrical conductivity). Monitoring conductivity using a conductivity meter helps growers maintain the correct nutrient strength for healthy plant growth.

Humidity affects plant transpiration, growth rates and disease risk. High humidity can increase the risk of fungal diseases, mould and mildew, while low humidity may stress plants, reduce nutrient uptake and slow growth.

Maintaining the correct humidity levels helps support healthy plant development, improve crop quality and reduce the risk of disease-related losses.

Most hydroponic nutrient solutions are maintained between approximately 18 °C and 22 °C.

This temperature range helps roots absorb nutrients efficiently while maintaining adequate dissolved oxygen levels in the water.

If the solution becomes too warm, oxygen levels can fall and the risk of root diseases may increase. If it becomes too cold, nutrient uptake and plant growth can slow.

Maintaining a stable temperature helps support healthy roots, consistent growth and optimal crop performance.

Hydroponic growers commonly use:

• pH meters
• Conductivity or EC meters
• Temperature probes
• Hygrometers
• Environmental data loggers
• Thermometers for nutrient reservoirs and grow rooms

These instruments help maintain stable and controlled growing conditions.

The best hygrometer depends on the application. Handheld hygrometers are ideal for spot checks and routine monitoring, while WiFi or USB data loggers are better suited to continuous environmental monitoring and digital alerts and record keeping in professional growing environments.