Wheat:  Net sales of 425,300 metric tons for delivery in the 2018/2019 were up 34 percent from the previous week, but down 4 percent from the prior 4-week average.   Corn:  Net sales of 779,900 MT for 2018/2019 were down 18 percent from the previous week, but up 6 percent from the prior 4-week average.   Soybeans:  Net sales of 596,300 MT for 2018/2019 were up 57 percent from the previous week, but down 15 percent from the prior 4-week average.  Soybean Cake and Meal:  Net sales of 329,100 MT for 2018/2019 were up 11 percent from the previous week and 82 percent from the prior 4-week average.   Soybean Oil:  Net sales of 19,600 MT for 2018/2019 were down 19 percent from the pre...