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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.
Warm Soil Temperature. Soil temperature correlates closely with bell pepperâs germination time. Although seeds will germinate within a temperature range of 60 to 90 degrees Fahrenheit, if you can raise the soil temperature with heating mats to 85 degrees F, the seeds may break dormancy in as little as eight days.he cooler the soil temperature, the longer the germination process will take -- sometimes up to three full weeks. Peppers will not germinate at a soil temperature below 55 degrees F.