The bull market in ag commodities reached a fevered pitch last week with drought, yield, and export concerns at key places around the world driving massive fund and commercial buying. Managed money traders bought 204,000 contracts across the ag markets through last Tuesday’s data reporting deadline, expanding their all-ags net long 36 percent in the process. Corn was by far the biggest driver of the increase in long positioning, followed by soybeans and to a much smaller extent wheat.  Last week, managed money traders aggressively expanded their corn long...