Originally Posted by ohimaria
But are they killed by the absence of oxygen or the anaerobic bacteria that are formed?
edit: re-reading I understand absence oxygen are bacteria born and eat the root?
I guess in a theoretically pathogen free environment, a lack of oxygen will stunt the plant's growth till death, because without oxygen plants can't ''breath'' (cellular respiration).
In the real life, we have bacteria and spores everywhere, even in a hydro nutritive solution, so at 99% a plant's death is caused by bacteria decomposing roots.
Firsts signs can be confused with a lack of nutes (and it actually is because the root zone can't provide enough nutes to the upper part)
But I was pointing a simple thing...I mean...dwc plants have roots always in water, so we know overwatering can't be a problem.
When you point the finger at the oxygen and not directly to the water itself, it could be useful to understand how to build a system, or how to timing it. No matter if oxygen comes from dry/wet cycles or directly from water, more it is, more the roots will be happy.
I know there is nothing new, but for a new grower can be useful to know