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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.
A soil temperature below 40 F delays the germination of the pea seeds. Soil temperature in the range of 40 to 75 F is ideal for germination.owing. Plant pea seeds in the early spring once the soil temperature has reached 45 F. Do not plant while the soil is wet and sticky; wait until the soil does not stick to your gardening tools.