It
can be beneficial to maintain the nutrient solution temperature within a
range of 20-25oC
(68-77oF).
This will usually be achieved if the
air temperature is controlled.
Still too cold? A cold nutrient
solution (or cold roots) can lower nutrient uptake. If nutrient temperature
remains excessively low, a ‘water heater’ can be used (Fig 6.21).
Too hot? Hot nutrient can cause
disease problems and suppressed nutrient oxygen levels. Small tank volumes
can be maintained by placing frozen water bottles directly into the nutrient
solution. However, for convenience (or larger tanks), a ‘water-chiller’ may
be required.
In either situation, burying tanks underground
will provide insulation against extreme temperatures.
