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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.
The usual temperature range needed for proper germination of seeds in a given soil type is about 41â° to 752 degrees Fahrenheit (5â° to 400â° Celsius.) Once the conditions are right, the plant inside starts to grow and get bigger. It pushes open the seed coat, a bit like a chick hatching out of an egg.