On 30 September, USDA/NASS will release its survey-based estimates of U.S. grain and soybean stocks as of 1 September. Since 31 August was the end of the statistical U.S. 2012/13 crop year for corn and soybeans, the 1 September stocks numbers from USDA will become the official 2012/13 ending stocks for each.Grain analysts and the corn market have come to dread USDA's quarterly corn stocks estimates. During the past three years, USDA's quarterly stocks reports have often come up with corn stocks estimates that have deviated so widely from expectations that they have shocked the corn market and defied explanation. There has been no particular pattern or predictability to the deviations. The quarterly stocks reports for wheat and soybeans ha...