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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.
Planting: Carrots (Daucus carota) are cool-season plants that grow best at average temperatures between 60 and 65 Â°F. The optimum soil temperature for seed germination is 55 to 75 Â°F. Seeds will not germinate above 95 Â°F.he optimum temperature is 50 to 65 Â°F. Optimum soil temperature for seed germination is 45 to 85 Â°F. Radish seed will not germinate when the soil temperature is above 95 Â°F. Spring-planted radishes should be harvested early.