Whereas Israel's obedience would bring blessings,  disobedience made Israel liable to God's curses.  These are spelled out in great detail.  Most of chap 28 is a list of the punishments of God.
    
         a.  total destruction (Deut 6:15, Deut 28:63)

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         Like the nations the Lord destroyed before you, so you will be destroyed for not obeying the Lord your  God (Deut 8:20).

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        b. drought (Deut 11:16-7)    

        c. lack of offspring, lack of prosperity (Deut 28:16-18, Deut 28:37-42)

        d. confusion, rebuke, sudden ruin (Deut 28:20)

        e. pestilence, heat, drought (Deut 28:21-24)

        f.  defeat by enemies (Deut 28:25-26)

        g. disease, madness, blindness (Deut 28:27-28, Deut 28:35, Deut 28:59-61)

        h. theft, bereavement, expropriation (Deut 28:30-34)

        i.  subjection to a foreign nation (Deut 28:36, Deut 28:43-44)

        j.  a byword among the peoples (Deut 28:37)

        k. siege and cannibalism (Deut 28:49-57)

        l.  exile, return to Egypt (Deut 28:64-68)
       
        And the final result:

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        He will put an iron yoke on your neck until he has destroyed you (Deut 28:48).