The plant was Iowa 's largest producer of nitrogen-based fertilizers and its loss Earnings_and_losses contributed Supply to a national 50 % increase Cause_change_of_position_on_a_scale in the cost Cost of fertilizer by the following year .

with respect to the triggering of the riots , the commission found Know that the incident which `` contributed Supply most to the outbreak was the jewish demonstration at the wailing wall on 15 august 1929 '' .