See the entire entry for būk̠rā, būk̠rṯā (bḵurtā) n.f. firstborn, first blossoming

PJ Ex34:26 :וארשין פירי אילניכון עם בוסרא בליבלוביהון וטרפיהון כחדא : I shall make the fruits of your trees ripen prematurely together with immaturity in their sprouts and leaves

See the entire entry for bswr#2 n.m. early grapes

PJ Ex34:26 :וארשין פירי אילניכון : I shall make your fruit trees ripen prematurely

See the entire entry for ršn vb. D to make the first