Break up for yourself fallow ground -- An agricultural metaphor urging the people to prepare themselves to accept God’s message and repent. - FSB
unplowed ground -- Husbandmen in the East are indolent, and sometimes ‘sow among thorns’ (Jeremiah 4:3). The Israelites are warned against committing this fault in their spiritual husbandry. Evil habits must be broken off, and a new character formed, or it will be impossible to sow the seed of righteousness.
A second appeal couched in agricultural metaphor is for Ephraim to “break up your fallow ground,” i.e., unplowed ground. This imperative implies a change in the old ways of this people and the commencement of a new course of life. Before seed can be sowed or harvest reaped, the ground must be prepared. Weeds must be removed. This again is a metaphor for repentance.
The agricultural metaphors are explained in the words “for it is time to seek Yahweh.” This may mean that it is high time to seek the Lord (Keil) or that there is still time to seek him (Brown). In any case, seeking the Lord involves reestablishing a relationship with him. “Till he come and rain righteousness upon you.” In this context “righteousness” means salvation or deliverance.3 Keil, however, understands: God will give the strength to secure righteousness just as he gives rain for the growth of the seed (10:12b).
3 The term “righteousness” means salvation or deliverance in Isa 46:12; 54:17; 32:16; 33:5.