Germinative measurements test a barleys germination energy, capacity (viability), and water sensitivity.
Germination Energy (GE):
100 seeds are placed in a petri dish with 4mL of water - germinated seeds are counted and removed over a three day period
During the test the petri dishes are kept at constant temperature (20C) and high humidity
Ideally 95% or more of the seeds germinate
If less than 95% germinate the grain may be dormant and just needs more time/cold treatment, or it may be dead
Germination Capacity (GC):
Used to determine if seeds that did not germinate in the GE test are dormant or dead
A dilute hydrogen peroxide mix is added to the 4 mL petri dish containing un-germinated seeds (after 3 day GE test is completed and the seeds that did germinate have been removed)
The seeds are checked after two days - those that have germinated were dormant, those that have not are dead
Water Sensitivity (WS):
Alongside the GE test a second set of 100 seeds are placed into a petri dish with 8mL of water - germination is counted over three days
The total germination is compared between the 4mL and 8mL tests. If the 8mL seeds have reduced germination of 30% or more the seed is considered water sensitive.
Example Germination Record