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originally posted by: D8Tee
a reply to: Greven
‘Number of pairs’ refers to the number of comparisons in which replicates of a particular cultivar grown at a specific site under one set of growing conditions in one year at elevated [CO2] have been pooled and
mean nutrient values for these replicates were compared with mean values for identical cultivars under identical growing conditions except grown at ambient [CO2]
The paper shows what is to be expected if they do not increase the Nitrogen fertilizer for the increased C02 rates.
Every year on the farm we would take soil samples and sent them in and fertilize accordingly.
You can't expect to change the C02 variable and not change the fertilizer applied to the crop can you?
I'm not an agrologist, but I suspect the crops were nitrogen limited, and the data indicates that.
The nitrogen fixing legumes and sorghum were not as low in protein as the non nitrogen fixing crops grown.
originally posted by: charlyv
It would be interesting if a "fossil fuel" phase is common in most alien civilizations, assuming they are biological.
A kick starter, if you will, to advancing to a stage where it can be replaced before it runs out. Would a coal layer have to be unique to Earth, or a planet much like Earth?
originally posted by: Greven
a reply to: D8Tee
Looks like it's also here if you want to read it.
An increase to CO2 only helps if it's the limiting factor. Greenhouses generally need CO2 pumped in because the plants within consume the CO2 in the semi-enclosed environment. This happens outdoors as well - corn fields, for example, will have reduced CO2 levels at ground level.