Changes in the climate might decrease yields, however CO2 concentration directly increases them. This should recover 60% to over 100% (wheat increased, soybean fully recovered) of the losses due to climate change depending on the crop from 2000-2080 according to NASA.

So if you take the 50% loss of corn due to lack of moisture stated in your report, recovered by 60%. It should be ~20% decrease (time period probably starts from 2020s in the report, so this calculation is off), while wheat will increase by 10% overall according to NASA.

Farmers may switch to the more productive crops to compensate.

https://www.nasa.gov/technology/nasa-study-rising-carbon-dioxide-levels-will-help-and-hurt-crops/