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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.
In the past iâve experienced slow germination times of up to 1 month or more. One of the key factors that affects germination speed and rates is temperature. It is generally accepted that the optimum temperature to germinate chillies is between 23-30 degrees Celsius (73-86 degrees Fahrenheit).If you can maintain your seedâs compost within this range then you should experience good germination rates.t is surprising how soil temperatures can vary, even a high end thermostatically controlled propagator. As the ambient temperature around the propagator cools (usually over night) soil temperatures can easily drop off 5-10 degrees or more.