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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.
Seed Germination. Soil temperature has an effect on how quickly seeds germinate. If the soil is at 75 degrees Fahrenheit, seeds usually germinate in about seven days. Cooler temperatures slow germination, with seeds in 60 degrees F soil taking two weeks to sprout.If the soil temperature goes down to 50 degrees F, seeds take about 43 days to germinate.ill the pots with growing medium to within 1 inch of the rim. Sow seeds 1/4 inch deep and spaced 1 inch apart, or about two or three seeds per pot.