Jim Harbaugh ends open practice at Levi’s Stadium after 45 minutes
SANTA CLARA – The 49ers have been talking about the Levi’s Stadium grass all week. Its roots haven’t set, the 49ers say. The footing is no good and patches of sod are coming up. Stevie Johnson slipped on the grass 45 minutes into practice, got up and started limping. Two plays later, Harbaugh pulled the team off the field and finished practice on the practice field which is closed to…