Hydroponics Tuesday

Outdoor Aeroponics, Attempt #2
6/10/2008 7:29:34 AM

Our first foray into outdoor aeroponics didn't end very well, and most of the blame resides squarely with me.  I'll admit that I put the young strawberries out into the cold world a few weeks too early.  We lost most of those first-round plants.  However, we did learn a few things from the experiment.

We have a few more strawberry plants now, and I thought it was time for a new experiment.  I've taken a single healthy strawberry plant, and placed it back outside in the tubular aeroponic unit.  Here's a photo of the little guy in his new home:

Hydro-2008-06-09b.jpg

In the past, I've always heard that root-zone temperature is critical for strawberries to survive.  This experiment will serve as a test.  For reference, we've had a real streak of hot weather lately.  Our daily high temperatures are between 95 - 100F each day.  The water temperature is about 85F, as the reservoir is buried about 18 inches into the ground.  I'd like to see how strawberries survive with such a warm root-zone.  We'll find out shortly.  Admittedly, if they survive at all, they will likely require frequent hydrogen peroxide cycles to keep down the extra bacteria growth.

On to other issues...

Our "food" eggplant continues to thrive.  Here's a photo of one of the upcoming fruit.  None are ready for harvest yet, but about five are in the works.

Hydro-2008-06-09a.jpg

The "food" eggplant has been great.  No complaints at all.  It's doing very well, living in the original DIY aeroponic unit.

Also, the CO2Boost Experiment is still underway.  At this point, both plants are roughly equal size (but different shapes).  It looks like the control plant will be the first to deliver fruit, but the supplemented plant isn't far behind.  Be sure to take a look for the latest updates.

Lastly, a brief discussion of our strawberries and their runners.  Here's a quick photo for reference:

Hydro-2008-06-09c.jpg

That confusing jumble of strawberries actually serves a very valuable purpose.  Our Fort Laramie strawberries produce runners (much like any strawberry that I've ever met).  These runners typically don't find many places to root in a hydroponic system, so we give them a little assistance.  When we see a runner begin to produce roots, we place the little fellow into a rockwool cube.  We leave the runner connected to the parent plant until roots have fully formed (and begin to escape through the edges of the cube).  Once the runner plant has roots, it's strong enough to be cut free from it's parent plant.  The process is much easier than cloning, due to the naturally convenient habits of strawberries.

We've got a list of people waiting for the little fellows, and I expect that we should begin deliveries sometime in July.  The runners reproduce fairly quickly, and all seems to be going very well. 

Posted By Red Icculus, Tuesday, June 10, 2008 5:41:02 PM
How deep is your nutrient solution flooding in the Megagarden if you are rooting strawberries in rockwool? How often are your flooding and what is your ppm?

That's an awesome way to do it!
Posted By Ben (Hydroponics Tuesday), Tuesday, June 10, 2008 5:57:58 PM
I've got the flood set to about 1/2" deep. It's deep enough to reach everybody, but not deep enough to make things float and flip. We run about 3-4 floods per day, at a PPM of 1000-1200.

Actually, we have an interesting way of arranging the flooding. We use two of the inexpensive analog timers (the push-down style). One is set to 14 hours of light. It powers a strip. In turn, the strip powers the lights and an additional timer. The additional timer is used to trigger the pump for the flood. This secondary timer is setup for 6 floors (one every four hours). The secondary timer's clock is never "correct", but it runs on a stable cycle, so it's not an issue. We've been pretty happy with this arrangement.
Posted By Red Icculus, Tuesday, June 10, 2008 7:04:10 PM
So you never flood in the dark? Interesting. I give one flood in the middle of the night out of paranoia.
Posted By Ben (Hydroponics Tuesday), Wednesday, June 11, 2008 6:33:55 AM
We stopped flooding "in the dark" when we were performing experiments with wheatgrass. We found that more mold would grow if we flooded at night. As it turned out, a fan remedied the situation. However, since the rockwool retains some water, we no longer found it necessary to flood during the night. What schedule do you run?
Posted By Red Icculus, Saturday, June 14, 2008 6:35:34 AM
In the Megagarden, when I am running hardy plants like peppers and tomatoes, they are flooded four times a day to minimize evaporation. I am gone a couple days at a time with work, so they don't seem to mind it.