Corn Export System
This U.S. Grains Council Corn Export Cargo Quality Report 2011/12 provides advance information about corn value by surveying quality when the corn is ready to be loaded onto the vessel for export. Corn quality includes a range of properties that can be categorized as:
- Intrinsic quality characteristics – Protein, oil and starch content, hardness, and density are all intrinsic quality characteristics and are of critical importance to the end user. Since they are nonvisual, they can only be determined by analytical tests.
- Physical quality characteristics – These attributes are associated with outward visible appearance of the kernel or measurement of the kernel characteristics. Characteristics include kernel size, shape and color, moisture, test weight, total damaged and heatdamaged kernels, broken kernels, stress cracking and potential for breakage. Many of these characteristics are measured when corn receives an official USDA grade.
- Sanitary quality characteristics – These characteristics indicate the cleanliness of the grain. Attributes include presence of foreign material, odor, dust, rodent excreta, insects, residues, fungal infection and non-millable materials.
The intrinsic quality characteristics are impacted significantly by genetics and growing season conditions and typically do not change at the aggregate level as corn moves through the marketing system. On the other hand, the physical and sanitary characteristics can change as corn moves through the market channel. The parties involved in corn marketing and distribution use technologies (such as drying and conditioning) at each step in the channel to prevent or minimize the loss of physical and sanitary quality. The Harvest Quality Report assessed the quality of the 2011 corn crop as it entered the marketing system and reported the crop as favorable. This Export Cargo Quality Report provides information on the impact of the subsequent practices including drying, handling, blending, storing, and transporting on the crop up to the point where it is being loaded for export. To provide the backdrop for this assessment, the following sections describe the export corn flow, the practices applied to corn as it moves through the market channel, and the implication of these practices on corn quality. Lastly, the inspection and grading services provided by the U.S. government are reviewed.