Root Zone Temperature
The temperature around the roots inside the growing medium or nutrient solution. It affects oxygen availability, nutrient uptake, root health, and irrigation response.
Root zone temperature is the temperature of the growing medium or nutrient solution surrounding the roots. It can differ from air temperature, especially under strong lighting, in dense canopies, on cold floors, or in recirculating reservoirs.
Root zone temperature affects root metabolism, nutrient uptake, dissolved oxygen, microbial activity, and disease pressure. Cool root zones slow water and nutrient uptake. Warm root zones reduce oxygen availability and can increase the risk of root stress in wet or poorly aerated systems.
Common management tools:
- Water chillers or heaters for reservoirs
- Insulated trays, benches, and containers
- Irrigation timing adjustments
- Airflow and floor-temperature control
- Root zone sensors placed in representative containers or slabs
The best target depends on crop, substrate, and system design, but stability is often as important as the exact number. Track root zone temperature alongside air temperature, VPD, irrigation volume, EC, and dissolved oxygen.
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