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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.
That is the fundamental relationship between germination and temperature. For every species of seed, there is an optimal soil temperature for germination, and at that temperature, the maximum number of seeds will germinate and in less time than at any other temperature.s a general rule, seeds will germinate indoors where the soil temperature is held constant. In nature, the soil temperature is usually lower at night. Therefore, an indoor drop in temperature at night of less than 10ÂºF will not significantly delay seedling emergence.