Soybean futures on the Chicago Mercantile Exchange ended their week lower due to a lack of follow-on buying after reaching a nearly two-week high. The March contract fell 7-1/2 cents to $9.89-3/4 a bushel, despite gaining 10-1/2 cents a bushel for the week. This decline is attributed to strong soybean crop prospects in Brazil and Argentina, where farmers are planting less soybean due to low prices in favor of other crops. In contrast, wheat futures ended higher, driven by strong weekly U.S. export sales and a weaker dollar, making U.S. grain more competitive on the world market. The U.S. Department of Agriculture reported that U.S. wheat export sales were higher than expected, supporting the rise in wheat futures.