For example, after today’s WASDE (the USDA’s World Agricultural Supply and Demand Estimates) report, November ’17 (/ZSX7) soybeans plunged from a high of 988.5 to a low of 938.5, closing at 943.5.
Interested parties can read the August ’17 WASDE report here: http://usda.mannlib.cornell.edu/usda/current/CropProd/CropProd-08-10-2017.pdf