A longer summary
of the study is at
the link below:
My short version follows:
Singh, H., Poudel, M.R.,
Dunn, B.L., Fontanier, C.
and Kakani, G.
2020
Effect of greenhouse
CO2 supplementation
on yield and mineral element
concentrations of leafy greens
grown using nutrient film
technique.
Agronomy 10: 323;
doi: 10.3390/agronomy10030323.
SUMMARY:
One possible
farming method
on non-arable lands
is hydroponic
greenhouses.
Inside a greenhouse
natural gas-burning
CO2 generators
are often used
to keep the CO2 level
above its concentration
in normal air outside
of the greenhouse.
Extra CO2 (800ppm
inside the greenhouse
versus 410ppm outdoors)
led to greater
plant growth here.
Extra CO2 caused
plant dry weight
to increase by:
26% (basil)
25% (lettuce)
and
48% (Swiss chard)
Elevated CO2
had no impact on
calcium, potassium,
sulphur, boron,
manganese or zinc
in any of the
three plant species
examined.
