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Accelerated Aging (AAT): A vigor test, where seeds are stressed with high temperature and relative humidity for a period of time prior to the germination test. High quality seeds tolerate such stress conditions and retain their capabilities to produce normal seedlings when germinated.
Conductivity Test (CT): A test to measure the integrity of the cell membranes. Low vigor seeds have leaky membrane structure and release electrolytes into the soak-water. The level of electrolytes is reflected in high electric conductivity of the soak-water.
Speed of Germination (SG): High quality seeds germinate faster than poor quality seeds. The number of normal seedlings recorded in the first count represents the population of fast germinating seeds and thus functions as a vigor measurement (AOSA Seed Vigor Testing Handbook). The following formula is used to calculate the speed of germination (SG):