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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.
Corn will germinate and emerge slowly and unevenly when soil temperatures are less than 50 degrees F. Thermal time from planting to emergence is approximately 115 growing degree days (GDDs) based on air temperature or about 119 GDDs based on soil temperature using the modified growing degree formula (Nielsen, 2008).ogether with soil moisture, the temperature determines the ideal planting time for many Michigan crops. The minimum threshold temperature for corn seed germination is 50 degrees F in the seed zone.