[chewbacha]

Decomposing biomass is called compost and you can layer it back down on the soil you grow grass-like plants in. This is what forests and prairies do naturally. Some amount of the biomass is left behind and becomes a silt layer.

Carbon emitted from the decay is not net positive into the air. It would still be net negative so long as you didn’t expend fossil fuels to bury it. In fact, I could burn some of the harvest to fuel burying the rest :)

Plus burning it would release the carbon faster than decay, and decay of CO2 into roots is generally just fixes by growing plants again. So the rate of carbon release would be dramatically faster to but versus decay. And what we want is net sequestering so slow release is good.

It’s literally the process that generated a low CO2 high O2 atmosphere in the first place, I’m just proposing we cultivate it and not harvest.