You have to go back to the 2014 Season with Ameer Abdullah (1611 yds) before you find Nebraska's last 1,000 yd single-season rusher and to 2012 and a different Martinez before you got a season when Nebraska had two 1,000 yd rushers, Ameer (1137 yds) and Taylor Martinez (1019 yds).
As of right now, Devine is at 600 yds and Adrian is at 415. Over the next 5 games, Devine needs to average 80 yds per game and Adrian 117 yds.
Now, Nebraska has an uphill climb if they are going to be rushing against Michigan St and Iowa (both tied with the second best rushing defenses)
Rushing Defenses
Michigan St - T-2nd
Iowa - T-2nd
Ohio St 57th
Illinois 117th
Bethune-Cookman 75th in FCS