Soybean futures on the Chicago Mercantile Exchange rose on Friday, driven by short covering, technical buying, and China's Sinograin's purchase of U.S. soybeans. This comes after soybean futures hit a four-year low due to forecasts of a large South American crop. Oversubscription of export sales reports also contributed to the price increase. In contrast, wheat futures remained unchanged but hit contract lows as strong global supplies, especially from the Black Sea region and Argentina, put downward pressure on the market.