Which test measures seed vigor or emergence potential beyond a standard germination test?

• A. Tetrazolium test
• B. Accelerated aging test
• C. Vigor test
• D. Root elongation test

Answer: (C)

Seed vigor gauges how fast and consistently seeds can emerge under less-than-ideal conditions, not just whether they can germinate in perfect lab setups. A vigor test is designed to mimic stress and measure how well a seed lot performs in the field, capturing emergence potential beyond a standard germination count. The other options focus on different aspects: the tetrazolium test shows viability by staining living tissues but doesn’t predict performance under stress; the accelerated aging test simulates storage deterioration to predict storability rather than field emergence; and the root elongation test provides a specific early growth metric, which is useful but not a general measure of vigor and emergence potential.