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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.
Optimum air temperatures for tall fescue germination are 68 to 77Â°F and soil temperatures greater than 60Â°F. Â· Kill all weeds by spraying the area with glyphosate (click for sources) two weeks before planting. Â· Mix in a layer of soil conditioner one inch thick. Till the soil thoroughly to a depth of six inches.