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Sunday, October 21, 2012

Maintaining nutrient concentration

by Darwin
(Alaska)

Your FAQ section was very helpful getting my Aeroponic system started. My tomato seedlings are now moving on into the vegetative stage. I am however, confused by your instructions regarding adding water rather than nutrients to maintain volume in the tank. If I just add water, I am diluting the nutrient concentration which I thought should remain stable. So, after adding water, I have been adding nutrients to keep my concentration at the correct level. Am I missing something here?
Thanks for the help.

_____________________

Answer from Stella:

The best way to explain is this: when your solution volume depletes due to evaporation, the only thing disappearing into the air is water, not the nutrients, leaving behind a stronger mix. So you top up for a while with just plain water. If you keep adding nutrients, you will end up with a way-too-rich mixture. After a few water toppings, you will change out the whole thing. This process is fully explained here, we have had great luck with this method:

Nutrient Solution
Hope this helps!

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