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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.
Warm-season grasses, like St. Augustine (Stenotaphrum secundatum), which grows in U.S. Department of Agriculture plant hardiness zones 8 through 10, rely on daytime temperatures hovering around 80 degrees Fahrenheit for successful germination.But air temperature may not be the best indicator of soil temperature.rass seed not in good contact with the soil cannot warm up correctly for successful germination. Seeds rely on warmth and soil moisture to swell and sprout. If your seeds remain at their ideal temperature range and are planted no more than 1/4 inch deep, you should see germination after three weeks.