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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.
Optimal Temperature. Pea plants grow well in moist, cool soil and thrive optimally in regions with moderate and cool weather. The optimum germination for peas is 45 degrees Fahrenheit. Peas as among the earliest spring crops that germinate best when soil temperatures are at least 45 degrees Fahrenheit.ptimal Temperature. Pea plants grow well in moist, cool soil and thrive optimally in regions with moderate and cool weather. The optimum germination for peas is 45 degrees Fahrenheit. Peas as among the earliest spring crops that germinate best when soil temperatures are at least 45 degrees Fahrenheit.