The LIFFE Wheat contract spent most of August ranging.  This followed the accelerated rise to the intraday high, at 169, at the very start of that month.

The beginning of September has seen the price bound upwards, clearing short-term range resistance at 156.5.  More importantly, last month's ceiling is within touching distance. 

On the downside, we observe that the RSI is now indicating an overbought condition.  Therefore, some recognition of the peak at 169 would not surprise.  It would take a downward dynamic to reaffirm a longer-term barrier, and possibly top building.