Thursday, October 13, 2011
Lots of these beans are normally rejected for food use.
US Grading Standards for soybeans suggest a grade 3 or lower can be assigned but is not specific to amount needed to cause that grading. Depending on the severity, the beans can often be used for livestock feed if used in limited amounts and properly processed and are also not materially weathered. Such weathering however is showing up in a few cases and here more caution is needed. Such beans should be further examined for pathogens and possibly toxins (although normally more rare in soybeans compared to weathered corn) to determine potential use. Such severely weather beans may receive a grade 4 at the elevator. If farmers plan to plant soybeans in the same field next year, tilling under the residue before planting would be a good cultural practice to reduce potential damage to next year's crop. More information and a photo are available at http://pdc.unl.edu/agriculturecrops/soybean/purpleseedstain
Zane R. Helsel