While USDA's August corn and soybean yield and production estimates may be more solid than July's projections, they still may vary considerably up or down from the final numbers.As Mike Krueger rightly noted in Monday's Ag Perspectives, USDA's WASDE could have considerable market significance this month. In fact, we can say that each year's August WASDE almost always does since it offers the first real yield and production estimates for spring planted crops that are based on actual test plot conditions, field tests and producer surveys. Heretofore, USDA has projected yields and production based on the 1 March or 1 June planted acreage estimates and assumed deviations from trend yields. The latter are derived from the estimated impact of the...