MEASURING DISSOLVED OXYGEN
The dissolved oxygen concentration of a nutrient solution can be measured
with a device known as a dissolved oxygen meter. A dissolved oxygen meter
will give calculate the concentration in parts per million (ppm). A very general
rule of thumb for hydroponic gardeners is to maintain a dissolved oxygen
content of at least six to nine ppm within the nutrient solution.
TEMPERATURE AND DISSOLVED OXYGEN
The temperature of the nutrient solution is the most crucial physical factor
associated with dissolved oxygen. Temperature inversely controls the solu-
bility of oxygen in water. So, as the temperature rises, the potential dissolved
oxygen content is reduced. As the temperature decreases, the potential
dissolved oxygen content increases. Fully oxygenated water at 68°F can hold
around nine ppm of dissolved oxygen.
“A VERY GENERAL
RULE OF THUMB
for hydroponic gardeners
is to maintain a dissolved
oxygen content of at least
six to nine ppm within the
nutrient solution.”
grow cycle
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