The 2005 growing season will be remembered by many because of the high yields. However, there are also a few farmers who will remember it as one of the driest on record. Eastern Iowa, central Illinois, and Indiana were under drought conditions during the majority of the growing season. As a result of drought stress conditions, some lots of soybean seed from these areas may have low quality with germination percentages below 90 percent. In addition, seed size also will be more variable from these areas. While seed size varies among varieties, it also depends on the environment where the seed is grown; therefore, we will see some variability in seed size this year even within the same variety.
Iowa State University
Pedersen, Palle, "Soybean seed quality in 2006" (2006). Integrated Crop Management News. 1212.
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