Wheat:  Net sales of 520,600 metric tons (MT) for 2020/2021 were up 32 percent from the previous week and 4 percent from the prior 4-week average.   Corn:   Net sales of 964,500 MT for 2020/2021 were up 48 percent from the previous week, but down 27 percent from the prior 4-week average.  Soybeans:   Net sales of 695,400 MT for 2020/2021 were up 97 percent from the previous week and 25 percent from the prior 4-week average.  Soybean Cake and Meal:   Net sales of 76,200 MT for 2020/2021--a marketing-year low--resulting in increases primarily for the Ecuador (34,300 MT, including 30,000 MT switched from unknown destinations), Guatemala (28,700 MT, including 6,000 MT switched from El Sa...