https://arstechnica.com/tech-policy...on-emissions-inflated-crop-prices-20-30/

sample quote

The researchers studied the issue from several angles, including examining how much additional land was needed to grow the corn, how much extra fertilizer was used, what the combination of the two did to water quality, and how crop prices changed in response to the RFS. The team looked at those changes between 2008—the year after the law requiring the standard was passed—and 2016.
(snip)
After the fertilizer was applied, it released a significant amount of nitrous oxide, a potent greenhouse gas that warms the atmosphere 300 times more than the same amount of carbon dioxide over 100 years. The researchers’ estimates of the carbon impact of the fertilizer are probably low, too, since the authors didn’t calculate how much additional pollution the manufacturing process released or the extent to which degraded water quality in downstream waterways released more greenhouse gases.

end quote

I have read a lot about NOx over the last 30 years,
and the above quote’s statement that NOx
“ warms the atmosphere 300 times more than the same amount of carbon dioxide”
is the first time I have seen that claim made.