to the soil in chunks, dry ice does not melt to for a liquid but sublimes directly back to a gas. Various unofficial and unsubstantiated claims that cannot be duplicated suggest that yields can be increased significantly with applications in low-lying protected areas The idea does not appear practical because of the volume of air involved and because of the large amount of CO2 required to produce a crop.
How much CO2 is required to produce a grain yield of corn of 6200 kg/ha (100 bulac)? This can be calculated as follows. The amount of CO2 required to produce a molecule of sugar (C6H12O6) can be determined from the balance photosynthetic equation.