Sorry to be bombarding you with these pictures, if you’re uninterested.
So, I’m just a few days away from the science fair, and I’m already disappointed in how rigourous I was not. If I do this for next year, I’ve got some ideas of how to really science this up.
That having been said, I’ve got the
This pea blossom is in one of the 2 "just fish water" columns.
This pea blossom is in the "CO2" column.
first blossoms from my pea plants!
The first pic, you can’t really see the blossom, but it’s in there. It’s the whitish ‘leaf’ right just up and left from centre.
The CO2 column has only been getting CO2 for the last 4 or 5 days, so there shouldn’t be loads of difference yet, even if I’m getting a meaningful amount in there.
How am I putting CO2 into this column of plants, you ask?
If you have an aquarium that’s heavily planted with real plants, you have a nice, natural support to your filtration. Unfortunately, the heavier the plant load, the more you run up against a limit on the plants’ growth – the amount of available CO2 in the water. Since the concentration of CO2 will be roughly equivalent to that in the atmosphere, since the fish are not as great producer of CO2 as land animals, CO2 supplementation helps encourage plant growth. Now you can spend LOADS of cash on a CO2 canister with all the bells and whistles ($00s of dollars) or you can have some soda pop, and DIY a CO2 generator.
2 cups of brown sugar, spooned oh-so-slowly into a pop bottle
drill a hole 1/16" smaller than the outer diameter of the airline. Cut the airline at an angle to make threading easier. Once you've got it in, hot glue a seal on both sides of the cap.
1 tsp of quick yeast (you can go as high as 1 tbsp, some say) and 1 litre of water. Don't slop the yeast on the sides of the bottle, it won't do much good there.
One nice thing about doing this instead for hydroponics instead of for an aquarium is that for the latter you need a fancy diffuser (there are, of course, DIY options).
So I just have the other end of the CO2 airline going into the top of the bag that’s around one of my plant columns. Simple.
So, my experiment was ‘is fish water as good as commercial hydroponics fertilizer’. There are a few caveats to my investigation. #1 is that I’m not stocking at true Aquaponics densities. They fill their tanks to the gills (heh. Get it? To the gills. It’s about fish) and so have a much higher nitrogen level than I have. They would also spread this over many more plants than I am. There’s a lot of variables, is what I’m saying. At any rate, here’s a few examples of the growth.
taken March 23rd
taken April 3rd
Not a bad amount of growth for… what, 12 days?
That’s it for tonight. Thanks for your interest, and have a good night. Good luck with your veggies.