Yellow tipping of leaves was observed in a number of barley varieties at Pyramid Hill, Spartacus CL pictured. This is characteristic of what this variety and some others closely related show at this time of year. Be sure to correctly diagnose any potential nutritional deficiencies or disease issues before addressing these, as it may just be leaf tipping. The crop will likely grow out of this as the season progresses. See an article form InterGrain from last year.