CO2 is a plant food

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CO2 is a plant food

Postby HBS Guy » 19 Nov 2017, 11:54

Say deniers everywhere.

That is way too simplistic—and ignores the AGW due increasing CO2.

Read this:
Increasing drought and diminishing benefits of elevated carbon dioxide for soybean yields across the US Midwest


Abstract

Elevated atmospheric CO2 concentrations ([CO2]) are expected to increase C3 crop yield through the CO2 fertilization effect (CFE) by stimulating photosynthesis and by reducing stomatal conductance and transpiration. The latter effect is widely believed to lead to greater benefits in dry rather than wet conditions, although some recent experimental evidence challenges this view. Here we used a process-based crop model, the Agricultural Production Systems sIMulator (APSIM), to quantify the contemporary and future CFE on soybean in one of its primary production area of the US Midwest. APSIM accurately reproduced experimental data from the Soybean Free-Air CO2 Enrichment site showing that the CFE declined with increasing drought stress. This resulted from greater radiation use efficiency (RUE) and above-ground biomass production at elevated [CO2] that outpaced gains in transpiration efficiency (TE). Using an ensemble of eight climate model projections, we found that drought frequency in the US Midwest is projected to increase from once every 5 years currently to once every other year by 2050. In addition to directly driving yield loss, greater drought also significantly limited the benefit from rising [CO2]. This study provides a link between localized experiments and regional-scale modeling to highlight that increased drought frequency and severity pose a formidable challenge to maintaining soybean yield progress that is not offset by rising [CO2] as previously anticipated. Evaluating the relative sensitivity of RUE and TE to elevated [CO2] will be an important target for future modeling and experimental studies of climate change impacts and adaptation in C3 crops.


http://onlinelibrary.wiley.com/doi/10.1111/gcb.13946/abstract

It always was stupid to assume more and more CO2 would just cause more and more photosynthesis even discounting the AGW effect of more CO2. Nitrogen is the other main essential element and more and more CO2 limits the plants uptake of nitrogen.
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Re: CO2 is a plant food

Postby MilesAway » 13 Dec 2017, 15:53

For some plants more co2 is beneficial.. but for all plants it is not the only limiting factor!
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Re: CO2 is a plant food

Postby HBS Guy » 13 Dec 2017, 16:11

CO2 is part of it but increasing temperatures from AGW caused by more and more CO2 fucks up transpiration, nitrogen uptake etc.

Simplistic rubbish for scared little fools like Booby, Lees and Grendel.
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Re: CO2 is a plant food

Postby MilesAway » 13 Dec 2017, 17:14

HBS Guy wrote:CO2 is part of it but increasing temperatures from AGW caused by more and more CO2 fucks up transpiration, nitrogen uptake etc.

Simplistic rubbish for scared little fools like Booby, Lees and Grendel.

Pause button politics aka propaganda!

“ Meh!”
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