As we have commented before, the market has had a chance to study the April WASDE, and the focus has now shifted to weather, new crop prospects, the Chinese economy and the ever present macro factors that affect non-commercial money flows into and out of markets. Perceived changes in any one of these market influences can cause grain and soy prices to make sharp, short-term movements. With soybean prices around $14.00 and corn prices bumping against $6.50, a "sharp, short-term movement" is often be measured in dimes rather than pennies.U.S. corn planting is off to a record-early start, although a weekend Midwestern rain event may cause a brief delay. Conventional wisdom says that: 1) early planting adds corn acres and subtracts soybean ac...