Export Sales for March 25-31, 2022.   Wheat:  Net sales of 156,300 metric tons (MT) for 2021/2022 were up 65 percent from the previous week, but down 11 percent from the prior 4-week average.   Corn:  Net sales of 782,400 MT for 2021/2022 were up 23 percent from the previous week, but down 44 percent from the prior 4-week average.  Soybeans:  Net sales of 800,700 MT for 2021/2022 were down 39 percent from the previous week and 38 percent from the prior 4-week average.   Soybean Cake and Meal:  Net sales of 66,200 MT for 2021/2022 were down 36 percent from the previous week and 68 percent from the prior 4-week average.   Soybean Oil:  Net sales of 6,200 MT for 2021/20...