Fig. 33

Day-of-heading and day-of-awn-appearance are often used to approximate the start of flowering in barley since they do not require dissection of the closed barley flowers. A. The day-of-heading is typically said to be the day when at least 50% of the first spike of a barley plant emerge above the flag leaf. B. Similarly, the day-of-awn-appearance is the day when approximately one cm of the awns is visible