northof420 t1_jec0848 wrote
Reply to comment by Orgot in ELI5: Why do people grow plants in greenhouse ? Is it more efficient than growing plants outside ? by dellive
Seeing your piped CO2 comment. Could you technically put a brick of dry ice in a greenhouse and let it vaporize off or would that just be a negligible amount of CO2? Small greenhouse in my backyard (about 6ā each side Iād guess) not some massive industrial greenhouse
Orgot t1_jecwjyr wrote
Good question! I don't know, but it should be possible to multiply the standard CO2 proportion of air by the density of air at your altitude by the volume of air in the greenhouse (216 cubic feet for a 6'x6'x6' greenhouse with nothing in it) to get the mass of CO2 inside at a given time. If you wanted to raise that by 10%, you'd just add that mass of dry ice - it has the same mass whether solid or gas.
But, air exchange with the outdoors will equalize that concentration gradient eventually, perhaps even as fast as the dry ice sublimates. Even in an airtight greenhouse, the enhanced CO2 levels will benefit some plant groups more than others, in a way that changes with day length and temperature. Timing probably matters too, with some plants shutting their stomata in the day.
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