India are coming off an innings defeat in the first Test at Centurion but Dhoni said that the cloudy, humid conditions and green wicket would help his team take the 20 wickets they need to level the three-Test series.
"In the last game we were not even able to take 10 wickets, which is always a worry if you want to win a Test match.
India have been boosted by the return to fitness of fast bowler Zaheer Khan, who has taken 261 wickets in 76 Tests.
