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Posted 16 June 2008 - 01:37 AM
Posted 16 June 2008 - 02:13 AM
Posted 16 June 2008 - 02:15 AM
Posted 16 June 2008 - 02:16 AM
Plants don't use c02 when the lights are off so 1500PPM during the lighting period is optimum but not practical unless a total sealed grow is done.
When is the best time to give plants CO2? When the sun is out or when it goes down? I'm going to open a tank in there but I want to do it at it's optimum time. Any help is appreciated.
Posted 16 June 2008 - 03:03 AM
Posted 16 June 2008 - 04:21 PM
Posted 17 June 2008 - 03:25 AM
how much co2 will a 20oz bottle filled half up with water, 2tbls yeast, and about 1/5th of sugar to water make?
Much discussion has been done on this and in the end it has shown to be less than productive as it only temporarily raises the PPM to 400-500 from the 300ppm in room air.
Sugar is c6h12o6 / mol. Density is 88 kg / m3 (or 88 g/L). Molar weight is 180.18 g/mol. 1/5 of an 20 oz is 4 oz, which is 118.29 ml. The chemical equation describing the reaction is c6h12o6 +02 --> c2h50H + 4c02 + h20. Therefore the stoichiometric ratio of completed fermentations will be 1:4, molar. You are starting with .11829 L, which is 10 grams. This is .0555 mol. At SATP, one mol is 24.6 L. This means the gas you have created takes up 1.37 L. As you can see, you're NOT really doing much. If you check wikipedia, 1% seems to be the amount they recommend. Normally C02 is like 0.0314%, by volume. So, unless your room has a volume of 100 ft^3...you probably aren't doing much.
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