Crop irrigation with carbon dioxide gas

Carbon dioxide is produced by the combustion of organic materials. These could be coal, oil, wood, straw, or municipal waste. Processes now exist whereby CO2 can be separated from the gases produced. CO2 is 1.5 times heavier than air and only mixes with air by turbulance. Crops cultivated in glasshouses have demonstrated increased growth by raised CO2 levels. I feel that by irrigating tall growing crops with CO2 gas, at ground level, would boost growth in open field culture. Biocrops such as copic willow and miscanthus grass could show greatly increased growth rates. I would love to try this but my city garden is too small. Has this been tried?

Don, while increased carbon dioxide can boost plant growth, the processes for separating carbon dioxide from flue gases remain fairly energy intensive. To then intentionally discharge this carbon dioxide back into the atmosphere (only a small fraction would be taken up by plants) is becoming less and less socially acceptable.

Peter. Thanks for your comment. At the moment ALL the CO2 produced by combustion is released into the atmosphere. There are proposals, in the UK and elsewhere, to separate the CO2 and pump it underground. If only a small proportion of this was irrigated, at a low dose level over a large area then the results might surprise. As they say, bioenergy is a growing market. Why not try to give it a boost. Once again, has it been tried?