From yāval (H2986), meaning to bring or carry along (as flowing water carries things). Yevûl refers to the produce or yield of the ground — crops, grain, fruit — the increase that the earth brings forth. It is a covenantal term, appearing significantly in Deuteronomy 32 and Leviticus 26 in contexts of blessing and curse.
The productivity of the land (yevûl) in Scripture is never accidental — it is always covenantally governed. Leviticus 26 makes the connection explicit: obedience to God's covenant results in the land giving its yevûl — its full yield (v. 4, 20). Disobedience results in the earth withholding its produce. Deuteronomy 11:17 warns that if Israel turns to other gods, 'the Lord's anger will burn against you and he will shut the heavens so that it will not rain and the ground will yield no produce (yevûl).' Haggai 1 applies this principle post-exile: the people had neglected the Temple while building their own houses, and the land was withholding its yevûl. The theology is one of created order as covenantal response — the earth itself participates in the covenant relationship between God and His people. Romans 8:19-22 extends this: creation groans and waits for redemption. The ultimate yevûl — the full harvest of creation — awaits the final restoration of all things.