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Agronomy QUESTION #2082
Question 1
The seed germination vigor test differs from a standard germination test in that:
  • Vigor tests measure the percentage of seeds producing normal seedlings under optimal controlled conditions identical to the germination test
  • Vigor tests assess the capacity of seed lots to perform under sub-optimal or stressful field conditions — using accelerated aging, cold test, or electrical conductivity — providing a more reliable prediction of field emergence than standard germination percentage alone✔️
  • Vigor tests are only applicable to vegetatively propagated crops
  • Vigor tests measure seed moisture content rather than germination capacity
Correct Answer Explanation
Standard germination tests use optimal conditions (temperature, moisture, light) that rarely exist in fields. Seed vigor tests (accelerated aging at 41°C/100% RH for 48–72 hrs; cold test at 10°C; electrical conductivity of seed leachate) assess membrane integrity and metabolic reserve — predicting field performance under stress. High germination% but low vigor = poor field emergence.