Agriculture Reference
In-Depth Information
Figure 8.8. Four different vigor levels of soybean seed after 4-hour exposure to 1% tetrazolium solution. A.
High vigor level with a vigor index of 3. B. Medium vigor level with a vigor index of 2. C. Low vigor level
with a vigor index of 1. D. Dead or nonviable seed because of lack of staining or structural weaknesses, with
a vigor index of 0. The number representing each vigor level is multiplied by the number of seeds in that
category, then added to determine a total vigor index. This is the TZ vigor evaluation method developed and
taught by Dr. R. P. Moore of North Carolina State University.
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