Ebla

bù-ḳú-lu - malt (VE 856; Kogan 2012: 245)

an entry in the bilingual lexical list from Ebla, = sum. mùnu

PS
*bVḳl- - a cultivated plant, shoot, seed, grain, cereal, vegetable (Fronzaroli 1969b: 5, 24, 32; Kogan 2012: 245)