Export Sales and Shipments for March 10-16, 2023   Wheat:  Net sales of 125,600 metric tons (MT) for 2022/2023 were down 63 percent from the previous week and 59 percent from the prior 4-week average. Export shipments of 361,600 MT were up 44 percent from the previous week, but down 8 percent from the prior 4-week average.  Corn:  Net sales of 3,095,900 MT for 2022/2023--a marketing-year high--were up noticeably from the previous week and from the prior 4-week average. Export shipments of 1,381,300 MT--a marketing-year high--were up 23 percent from the previous week and 57 percent from the prior 4-week average.  Soybeans:  Net sales of 152,500 MT for 2022/2023 were down 77 percent from the previous week...