It is common practice in greenhouses to increased CO2 to levels several times higher than the atmosphere, in order to increase yields. http://pods.dasnr.okstate.edu/docushare/dsweb/Get/Document-10655/HLA-6723web.pdf …
Interesting, I’ve never heard of that – at what level of CO2 does this effect kick in, and to what degree?https://twitter.com/Res_Politica_/status/1082099344680075265 …
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With the optimal growth for most plants occurring at 2000-2500ppm being much higher than the 'globalwarmingfreakout' levels touted in paris. And the nitrogen intake isnt affected by co2 absorbtion in the hundreds of studies Ive read.
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The study I linked said optimal was 700-1800 ppm, but I suppose it depends upon the crop. Nutrition is only affected marginally. It's obviously not very much because this is common practice, and no one worried about it until they need to invent excuses to make CO2 evil.
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Exactly. As for the level, your link gives an economically efficient lvl. Its quite expensive to maintain an industrial size greenhouse at 2000ppm apparently.
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I don't have access to the full study for specifics, the abstract merely notes "elevated CO2" (denoted as eCO2 in the abstract) Source: https://onlinelibrary.wiley.com/doi/abs/10.1111/gcb.12938 …pic.twitter.com/o7GjsMv0Qt
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The data they used for their meta-analysis was based on CO2 concentrations of 500/550/600+ ppm. These levels are significantly higher than the current CO2 levels that we have and the N decreases are minor and may be accounted for by a change in a constant variable.
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Currently, it's not a pressing issue yes, but that doesn't disqualify this from being a potential problem if CO2 levels continue increasing. Also I may have honestly missed something, but I don't see how a 10% decrease in absorbed Nitrogen is minorpic.twitter.com/WKXeuOuErW
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A 10% change is statistically significant but the problem is that there was no measure to determine if this was biologically significant. Additionally, when you look at their CI, it is very close to the null in most of the data and with the small sample size means I have doubts.pic.twitter.com/fMPctUqOaC
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It depends on the plant. Every species has a different optimum value.https://bmcplantbiol.biomedcentral.com/articles/10.1186/s12870-018-1243-3 …
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Yes. Please. Details.
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Oxygen Isotopes. Present day at top of the graph.pic.twitter.com/UmWeQP2rH4
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Exactly, that’s the question. But they won’t give an answer. So, we need to trust their authoritarian policies forcing us to do what the government says.
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http://www.sciencedirect.com/science/article/pii/S0169534702025879 … http://www.politico.com/agenda/story/2017/09/13/food-nutrients-carbon-dioxide-000511 … http://onlinelibrary.wiley.com/doi/10.1890/15-0217.1/full … http://rspb.royalsocietypublishing.org/content/283/1828/20160414 … https://ehp.niehs.nih.gov/EHP41/ http://environment.harvard.edu/sites/default/files/piis2214109x15000935.pdf … https://www.nature.com/nature/journal/v510/n7503/full/nature13179.html … https://elifesciences.org/articles/02245 http://www.fao.org/state-of-food-security-nutrition/en/ …
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key point: these experiments were Nitrogen limited, not fields with plenty of fertilizer "As the ecosystems were markedly N limited, plants with minimal productivity responses to eCO2 likely acquired less N than ambient CO2‐grown counterparts because access was decreased,"
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The study you linked is about terrestrial ecosystems (forests and grasslands) and not about agriculture. So, extra fertilizer isn't added in that case. But extra fertilizer can be added for agricultural crops. Here is a study for farmed vegetables:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6104417/ …
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