Somehow, World Water Day hadnt made it to my radar screen. But the rest of the world has been concerned about water use for decades.
The United Nations theme for this year is Water and Food Security - crazy important. A topic that is very close to my heart.
Unfortunately, I couldnt find an embeddable version of their instructive animation. But because I think this should be better known, I converted content from the UN website into a youtube video. Im not trying to raise funds or make money off any of this, so I should be in the clear... Below is the final result, with background music written by Little Red King, appropriately named "Rain in the Desert."
So what are you planning to do for World Water Day on March 22nd?
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Sometimes you want to grow plants without using "media." In that case, you need some method for suspending your plant over the surface of the water.
Ive seen folks use foam rafts, wooden structures supported on air-filled water bottles, or water-filled bins with holes cut in the lid. The plants are put in "net pots" to provide some support while allowing the roots to grow through the mesh/net of the pots.
Ive used foam rafts. But you want to make sure you select the right foam. There are three basic foam insulation board products on the market produced under several different manufacturer names. The basic types of foam board insulation include: polystyrene, polyurethane or polyisocyanurate.
Expanded Polystyrene (EPS) - This is the white foam board that is made up of lots of tiny white foam balls. Even though this isnt toxic, you dont want to use this for aquaponics. The stuff will disintegrate relatively quickly, leaving you with a white, snowy mess.
Extruded Polystyrene (XPS) - This is what you want for aquaponics. Folks typically recommend the 2 inch thick Dow product (blue board). However you may find other brands at your local hardware store, and the colors will vary depending on the manufacturer. For example, pink is the trademark color for the Owens Corning product, Lowes GreenGuard product is (surprise) green. In all cases, make sure youre dealing with extruded polystyrene rather than some other chemical.
Polyurethane (PUR) or Polyisocyanurate (PIR or ISO) - Fully reacted polyurethane, itself, is chemically inert. The problem is that the stuff you can buy at the hardware store is typically "improved" to increase the insulation properties (R value). This "improvement" is achieved by adding isocyanurates, which are hazardous chemicals. The list of potential human hazards from exposure to isocyanurates is long and scary - and I wouldnt want my fish exposed to this stuff (or have the roots of my plants bathing in a weak isocyanurate solution). Folks on the web will often equate pink foam with polyisocyanurate, but that is not necessarily the case. Check the chemical composition of the foam you intend to buy and just make sure youre getting XPS and not PIR or ISO.
Lay out where the centers of your holes need to be. I use 3" spacing between centers for the 2" net pots Ill use to start seedlings or allow cuttings to root. Youll want to use 6 inches or more between centers if you want your plants to grow to maturity in the floating raft - this will be OK for plants like lettuce.
To drill the holes for 2" net pots, I recommend a standard 2-1/8 inch Door Knob Hole Saw and another drill bit that is long enough to go all the way through your foam. Drill a small hole at the center of each location, then drill part through one side at each location with the hole saw. Flip the foam and finish drilling the holes from the other side, using the center holes as a guide.
A Door Know Hole Saw bit
To prolong the life of your raft, you can paint the foam with white latex paint.
Heres a video showing the basics of a 2 inch thick floating raft that will fit in a 50-gallon Rubbermaid tank.
N.B. - If your plant roots are "dark," this may be due to particles in the water youre piping in under your floating raft. In that case, consider adding some kind of filtration to reduce the particulate content.
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Si la contingencia tanque arboladura que tu cama de crecer, así como nosotros no Cabalgata la sirena vacía en, necesitamos el puente de H2O. No más algunos sifones violación así como sumideros inundaciones. Sin preocupaciones acerca de las interrupciones de energía. Este complemento de recrudecimiento sucesivas es discutible suficiente tener en interiores. Video Rating: 5 / 5
Entradas relacionadas:
Aquaponics HD: modificacion del sistema aquaponics barril, agregando un venturi, de agua solar heaterAquaponics-semana 1: cultura de agua profunda (DWC) HD Aquaponics: calentador de agua caliente, lechuga de dwc balsa flotante, tilapiaAquaponics-4 growbed elevado systemWater almacenamiento de información: tanques, cisternas, acuíferos y estanques para suministro doméstico, fuego y emergencia Use–Includes cómo hacer los depósitos de agua de ferrocemento
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Its 10:30 pm and ive just done the first water quality check for this system... Im expecting everything to be fine as my setup already has a lot of bacteria from the previous setup...
pH, Ammonia, Nitrate Test... I left Nitrite out...
I used a wide range pH tester. That greenish color indicates a pH of around 7.0. Ammonia test shows a good yellow color. Nitrate is nearing the 50mg/l red tea color zone- probably around 40mg/l...
Will be posting another update on my plants soon...
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The most complete, affordable and accessible guide to Australia freshwater aquaculture, with emphasis on the sustainable use of resources: either on a small scale in a pond in the backyard or commercial production in broad acres. The book includes detailed information on design and construction of ponds of water quality, improve production through aeration, the wetland for treatment of water and filtration, food and feeding, breeding and spread of aquatic animals and plants, sources of stock and
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