USDA Agricultural Marketing Service (AMS)
USDA Corn Standards
The official USDA grading system for corn (maize) sold in US trade.
View official standardAbout this standard
The United States Standards for Corn, maintained by the USDA Agricultural Marketing Service (7 CFR §§ 810.401-810.405), define grade factors including damaged kernels (heat, ground, weather, disease, frost damage), broken corn and foreign material (BCFM), and test weight. Vibe imaging workflows measure the same damage and morphology parameters these grades depend on.