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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.
They germinate best when daytime temperatures are between 60 and 85 degrees Fahrenheit. Temperatures of 70 to 80 degrees are ideal. At these temperatures, beans germinate within eight to 10 days. At temperatures below 60 degrees, the seeds might take more than two weeks to germinate.Wait to plant bean seeds until two weeks after the last expected frost, or start them indoors four weeks before the last frost.hey germinate best when daytime temperatures are between 60 and 85 degrees Fahrenheit. Temperatures of 70 to 80 degrees are ideal. At these temperatures, beans germinate within eight to 10 days. At temperatures below 60 degrees, the seeds might take more than two weeks to germinate.