Want to build a fun, cool and green science project. Then try Hydroponics. Hydroponics is a project that you can build into an ordinary 2 liter soda bottle. All you need are a few inexpensive items and a few seeds and you can build a fully working hydroponic set. This works best with smaller plants, such as radishes which I will be using.

Step 1: What you will need

1. A two liter soda bottle
2. A coffee filter
3. Plant seeds
4. Duct tape
5. Scissors or hobby knife
6. A strip of felt
7. A marker
8. Perlite (You can find this at a gardening store or hardware store.)
Note: I am not responisible for any damages made to you or anything else with any of the materials you use for this project SO BE CAREFUL

Step 2: Cut the Bottle in Half

First to make the container for the plant you will have to cut the bottle open. Put a line with the marker just below where the neck starts to curve. Cut on this line Tip: If you use scissors you have to pinch the bottle where you are going to cut.

Step 3: Prepare the Soda Bottle

Pic 1 - First you have to take off the cap to the bottle
Pic 2 - You have to put the top of the bottle in the bottom of the bottle
Pic 3 - Put tape on the bottle to hold it in place
Pics 4,5 and 6 - Put tape on the top and bottom of the filter, lining them up.
Pics 7,8 and 9 - Cut a slit in the tape about 1 1/2 inches long and insert the felt in the slit. Have a little felt sticking out over the filter.

Step 4: Add the Perlite and Plant the Seeds

Pic 1 - Perlite in the bag.
Pic 2 - Put about 2/3 cup of perlite to the coffee filter.
Plant seeds in the perlite about an inch in.
Pic 3 - Add water by pouring into perlite
Put it into a sunny place and add water when the water in the bottom is low.
In 4 -5 wks. the plant should sprout
I think you might have better luck with larger rooted plants if you wrap the bottle with aluminum tape to keep all that nasty old light off of those tender little roots. =^..^=
it's looks good! i will try it back home.
So...what sort of nutrients are these plants using?
I think the plants are using the perllite for food because i think that when you pour the water through it sort of fertilizes it so the water has nutrients for the plant in it
that's incorrect. your nutrient solution feeds the plants. the perlite gives the plant's root system something to anchor to.
Perlite... Doesn't contain any nutrients. It's really just superheated volcanic rock.
Although it does contain little Calcium, you're correct. Best option is what Rocketfueler posted.
Miracle Grow does have perlite that's infused with Miracle Grow. I use it. Can get it at any Home Depot or probably even Walmart. You can use it with no other growing medium -- all by itself -- and it will feed your plants just fine.
Thanks. I'm going to build one. I love radishes :)
I just need to find a soda bottle somewhere...
Buy soft drinks!!!! YEAH!!!!
You could buy a cheap 2 liter seltzer bottle
If it works good for you and you like it please vote for it in the earthjustice contest
Before building this, I was just curious, does this work by evaporation, or does the plant just get enough water when you water it?
The water soaks up through the felt. When you water it though you have to pour it through the top so it goes into the bottom resivoir.

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