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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.
Temperature. Grass seed germinates when the soil temperature is 65 degrees and above. It's important to understand that it is the soil temperature, and not the surrounding air temperature, that is the trigger for seed germination.rass seed needs a minimum temperature of 65 degrees and will germinate faster at higher soil temperatures as long as the increased heat doesn't dry out the seeds and soil.