Wheat The Buenos Aires Grain Exchange, as other exchanges and analysts have done, lowered its wheat crop estimate to 17.5 MMT versus 20.5 MMT in its previous forecast. The reason, of course, is the severe drought causing serious problems for crop development and currently limiting grain filling in the north. Consequently, sharply lower yields are expected for this year. There are even fields where farmers decided to fumigate the wheat crop and prepare the soil for an early soybean crop. Rainfall maps are starting to show some precipitation for mid-October, which will surely help, but it does not seem that amounts will be large enough to offer substantial benefit and irreversible crop damage has already occurred.  Forecasts are also s...