"Corn yields" refers to the amount of corn that is produced or harvested from a specific area of land, such as a farm or field. It indicates how much corn is obtained from a particular plot of land or a specific farming method. Full definition
Heat, for example, may increase crime or cause corn yields to fall, but it also could lower fatalities driven by exposure to the cold. (sciencemag.org)
Corn yields represent the «commodity and market» year reported. (c3headlines.com)