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The minimum temperature for germination of barley is 34 degrees to 36 degrees F (1 degrees - 2 degrees C). After the seed takes up moisture, the primary root (radicle) emerges. The radicle grows downward, providing anchorage and absorbing water and nutrients, and eventually develops lateral branches.arley can be distinguished by differences in head type and growth habits. In a six-rowed barley, three kernels are formed at each node of the head while in a two-rowed type, only a single kernel forms at each node (figure 1). Barley is also classed by its requirement for cold temperatures.
Seeds germinate when the soil reaches a specific temperature range surrounding an optimal temperature. The closer the temperature is to the optimal temperature for seed germination, the more seeds will germinate in the shortest amount of time.For example, although 90 percent of all onion seeds will germinate if planted at 32 degrees Fahrenheit, they will take up to 136 days to sprout.By contrast, 99 percent of onion seeds will germinate if planted at 68 degrees Fahrenheit and will take less than five days to grow.eeds germinate when the soil reaches a specific temperature range surrounding an optimal temperature. The closer the temperature is to the optimal temperature for seed germination, the more seeds will germinate in the shortest amount of time.