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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.
For instance, the optimum soil temperature for seed germination of vegetable crops such as cucumber, cantaloupe, okra, pumpkin, squash and watermelon is 95 degrees F, but the heat of summer will decrease yields and plant vigor.oil temperatures at which vegetable seed will grow are classified into four categories-the minimum temperature required for seed growth, an optimum temperature, a realistic soil temperature and, maximized temperature above which little germination will occur.