Hydroponics Tuesday

Aero and pH
10/16/2007 7:52:57 AM

This week's report really isn't as dramatic as some previous reports.  Things are growing at a good pace, but the situation is fairly stable.

However, I would like to mention something, in case you haven't heard it before...  An aeroponic system (like my TurboGarden) helps plants grow very quickly.  Since so many changes are taking place under an aeroponic setting, you have to be very mindful of the condition of your reservoir.  Normally, the water chemistry is fairly stable... However, in an aeroponic system, like the TurboGarden, this really isn't the case. Admittedly, the TurboGarden has a fairly large reservoir tank (about 25 gallons when full).  However, there's so much growth activity going on, that the chemistry changes rapidly.  The TurboGarden consumes a lot more nutrients than my other system, and the pH changes much more dramatically.

This may sound strange to someone new to aeroponics, but I add almost 1 pint of pH increaser to my TurboGarden each week.  That's a lot of pH increaser.  Although I don't understand all the plant biology involved, I can tell you from experience that the plants just suck the pH right out of the water.  I check the pH every morning, and most of the time I find it around 6.0.  I realize that 6.0 is still in a good range for the plants; but I also know that it will continue to drop unless I supplement it.

I really need to buy more twine.  I need to tie some of the plants, like the eggplant.  It's not being a good neighbor at the moment.  Additionally, the eggplant is flowering.  We have several flowers, but no baby fruits yet.

I'm not quite sure what's going on with our younger tomato plant.  It doesn't look as good as I would expect.  The chemistry is good.  I'm suspecting a heat issue (as it's tall, and closer to the light source).  As an experiment, I've laid it down, in the strawberries. 

Here's this week's photo:

Hydro2-Y.jpg

PlantTypeStatus
#01Alexandria Alpine StrawberriesRoughly 10" long (longest leaf).  No burning.  Looking good.
#02Alexandria Alpine StrawberriesRoughly 10" long (longest leaf).  No burning.  Looking good.
#03Alexandria Alpine StrawberriesRoughly 11" long (longest leaf).  No burning.  Looking good.
#04Alexandria Alpine StrawberriesRoughly 9" long (longest leaf).  No burning.  Looking good.
#05Alexandria Alpine StrawberriesRoughly 10" long (longest leaf).  No burning.  Looking good.
#06Alexandria Alpine StrawberriesRoughly 10" long (longest leaf).  No burning.  Looking good.
#07Alexandria Alpine StrawberriesRoughly 7" long (longest leaf).  No burning.  Looking good.
#08Alexandria Alpine StrawberriesRoughly 11" long (longest leaf).  No burning.  Looking good.
#09Alexandria Alpine StrawberriesRoughly 11" long (longest leaf).  No burning.  Looking good.
#10Andrew Rahart's Jumbo Heirloom TomatoApproximately 33" long (it's not standing straight anymore, as it's tied to the lightstand).  Has some old burning visible, but appears quite strong.  I'm starting to become concerned that it's grown tall enough to be too close to the light again.  If I see more burning appear, I may relocate.
#11Delicious Heirloom TomatoPreviously killed through personal stupidity.
#12Bambino Baby EggplantThis fellow is really dominating the TurboGarden.  It's big and wide.  I need to add twine to stabilize.  Flowers are visible, and I'd expect baby fruits soon.
#13Monet's Garden Lettuce
Amazingly, still alive.  We ate almost all the leaves, but somehow, it's living and sprouting new ones.
#14Monet's Garden LettuceAmazingly, still alive.  We ate almost all the leaves, but somehow, it's living and sprouting new ones.
#15Monet's Garden LettuceAmazingly, still alive.  We ate almost all the leaves, but somehow, it's living and sprouting new ones.
#16Monet's Garden LettuceTasty.  Eaten on 09/29/2007.
#17Lime Basil
Roughly 19" tall.  No burning visible anymore.  Very healthy.  Very tasty.
#18Delicious Heirloom TomatoOddly, not as strong as it's older brother.  It doesn't have as many branches or leaves, and it appears to be having trouble with the heat from the lighting system.  I've laid it down horizontally in the strawberries to test my theory.
Posted By Red Icculus, Sunday, January 20, 2008 9:06:11 AM
That is a lot of pH adjustment and money involved. My homemade aeroponic bucket is fairly stable due to a good water source. Have you thought about investing the money that you spent on something like reverse osmosis water from the grocery store? It has saved me a lot of headaches.
Posted By Ben (Hydroponics Tuesday), Sunday, January 20, 2008 10:47:36 AM
Red,

This was an earlier post, and I really should have posted a follow-up to it...

It turned out that I had an acid-producing bacteria living in the TurboGarden. I consulted a grower that was much wiser than myself, and he instructed me to add 35% hydrogen peroxide to the system as a "bacterial reset". The peroxide is nasty stuff and you need to be careful. It will kill all your beneficial biology, so it's best to restock after it clears the system. However, it killed off that acid-producing bacterial; and everything has been much more stable ever since.

In unrelated news, about a month after this article was posted, we switched to running filtered water for all the plants. We don't use a full reverse-osmosis, just a Small Boy for the chlorine and chloramine. It's worked out great.