don't know about 'never' or non-US exporters but at least in 2009 and 2010 China did not import significant quantities of wheat from the US. chk out "Top 10 U.S. agricultural export markets for wheat, corn, soybeans, and cotton, by volume" http://www.ers.usda.gov/Data/FATUS/#monthly i don't know how 'volatile' the grain export data are but China imported nearly 10x more corn from the US in 2010 vs 2009 China is, by far, the largest importer of US soybeans in the world. the other biggie crop export from US to China is cotton (again China largest importer)