Showing posts with label movement. Show all posts
Showing posts with label movement. Show all posts

A Vital Movement

Im having fun, and watch my nutrient levels like a hawk.  I feel obligated to do this because these vegetables are expensive.

The one thing the aquaponic experience has done for me is give me a much greater appreciation for the food I buy at the grocery store.  While Im delighted to eat a fresh tomato even if a worm has put a small hole in it; I would not buy that same produce at the store.

I think about it every time I shop at Costco.  Enormous quantities of perfect produce everyday.  People are always bad mouthing current farming practices, but when it comes down to it, the commercial production of food is a lot more difficult than most people realize.

Aquaponics has been around for a long time, but it seems that its only now beginning to catch on.  With droughts and population explosion I feel that our experimentation, and sharing of information is contributing to a vital movement toward small household food production which will help carry many of us through rough times.  Some of us may go on to create commercial systems which will take agriculture back to a less destructive method once we understand the problems we are likely to face, but we are all making a collective difference.

Aquaponics is not without fault as it does tend to influence the genetic makeup of the fish we are breeding.  But it may also help to relieve the stress of over fishing.

So I look at my $3000.00 tomato, and know that its not about that tomato, but a contribution to the greater good, and enjoyment of creating my own food.

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Aeration And Water Movement

 
These plants thrive right above the air stone!  (LINK)
Could this be caused by the movement of water through the roots or is it increased oxygen?  In any case, whether its due to increased oxygen or water movement it is obvious that air stones in the raft tank are quite beneficial.

I asked Forest, my friend and hydroponic guru, if it might be due to water movement.  He felt strongly that its the improved oxygen in the water rather than water movement.  Im still on the fence about that, but Forest really knows about hydroponics so I tend to believe what he says.

But this has gotten me thinking  about adding an aquarium PowerHead and/or incorporating an Under-Gravel Jet System as described at this link.  The Under Gravel Jet appears to be very similar to a Fluidized Sand Filter.  
I found this article about designing a Fluidized Sand Filter.  
Further research shows that they can be designed to remove Nitrates as well as Ammonia and Nitrites.  This of course is not what we would desire in an aquaponic system, but it appears easy enough to avoid removal of Nitrates by not building the filter too deep.
 


Devin uses very large 12" air stones in his raft tanks under the gravel.  Yes he places gravel in the bottom of his Floating Raft tanks.   His results are astounding and I tend to agree with Devin about Rafts vs Gravel beds.   Transplants do better when placed into a raft and growth rates seem to be better, and with good aeration the raft systems can only be improved.

I bought a Hydrofarm Active Air Pump.  
Its a bit noisy but an optional volume control can turn adjust the volume and the noise.

* UPDATE October 10, 2012 -  This Hydrofarm pump has been running 24/7 for 4-1/2 months.  It progressively became louder until it sounded like a jack hammer.  Two days ago I turned it off and replaced it with a new EcoPlus Commercial Air 5.   Even after rebuilding it with parts supplied by the distributor it was no longer working properly.    I have high hopes for the new EcoPlus Commercial Air 5.  It runs much cooler than the Hydrofarm pump which ran so hot I could not even touch .
The new EcoPlus Commercial Air 5. is by no means silent, but it purrs with a low tone rather than a raspy and unpleasant noise. 
The noise was too much so I placed the air pump inside my shop and plumbed the line out to the system
Heres a video about how to repair an air pump


Today I placed four fat air stones in this raft tank under about 4 inches of gravel.
 
Its about time to make some better rafts 8-)

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