Corn seed (or corn grain) is graded to determine the quality of the grain. Standards are determined by the USDA for various categories of corn (U.S. No. 1 being the highest grade). Grading includes factors such as test weight, percentage of intact kernels, percentage of damaged kernels and percentage of foreign matter (weed seeds, soil, etc.). For more on grading of corn or other commodities, go to the US Grain Standards website at: http://www.gipsa.usda.gov/GIPSA/webapp?area=home&subject=grpi&topic=sq-ous

For more information on this or other topics related to corn production, contact your state extension corn specialist or your local extension educator/agent.

The following is the link to the corn extension specialists: state extension corn specialist