Wheat:  Net sales of 387,600 MT for 2018/2019 were up 2 percent from the previous week, but down 16 percent from the prior 4-week average.   Corn:  Net sales for the 2018/2019 marketing year, which began September 1, totaled 774,200 MT.   Soybeans:  Net sales for the 2018/2019 marketing year, which began September 1, totaled 693,500 MT.   Soybean Cake and Meal:  Net sales of 34,900 MT for 2017/2018 were down 50 percent from the previous week and 70 percent from the prior 4-week average.   Soybean Oil:  Net sales of 4,700 MT for 2017/2018 were up noticeably from the previous week, but down noticeably from the prior 4-week average.   ...