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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.
Adequate and uniform soil temperature at the seed zone. Corn will germinate and emerge slowly and/or unevenly when soil temperatures are less than 50F. When soils warm to the mid-50's or warmer, emergence will occur in seven days or less if soil moisture is adequate.orn will germinate and emerge slowly and/or unevenly when soil temperatures are less than 50F. When soils warm to the mid-50's or warmer, emergence will occur in seven days or less if soil moisture is adequate.