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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.
Wait to plant until the soil temperature is right. In general, corn should be planted when soil temperatures are near 50 F. Seed will absorb about 30 percent of its weight in water, and temperature does not affect water imbibition much.This is different than radicle (root) and coleoptile (shoot) growth; their growth is correlated with soil temperature.n general, corn should be planted when soil temperatures are near 50 F. Seed will absorb about 30 percent of its weight in water, and temperature does not affect water imbibition much. This is different than radicle (root) and coleoptile (shoot) growth; their growth is correlated with soil temperature.