Export Sales and Shipments for February 17-23, 2023   Wheat:  Net sales of 284,100 metric tons (MT) for 2022/2023 were down 16 percent from the previous week, but up 39 percent from the prior 4-week average. Export shipments of 610,000 MT were up 81 percent from the previous week and 30 percent from the prior 4-week average.  Corn:  Net sales of 598,100 MT for 2022/2023 were down 27 percent from the previous week and 48 percent from the prior 4-week average. Export shipments of 666,400 MT were down 3 percent from the previous week, but up 13 percent from the prior 4-week average.  Soybeans:  Net sales of 360,700 MT for 2022/2023--a marketing-year low--were down 14 percent from the previous week and 25 p...