芝加哥玉米期货周五涨超2.1%，本周大豆期货涨5.7%

Core Insights - The Bloomberg Grain Index increased by 1.31% to 29.1287 points on Friday, August 15, with a weekly gain of 1.64, indicating a W-shaped trend overall [1] - CBOT corn futures rose by 2.14% to $4.0575 per bushel, showing a U-shaped trend and remaining flat for the week [1] - CBOT wheat futures increased by 0.48% to $5.2725 per bushel, but experienced a weekly decline of 1.40% [1] - CBOT soybean futures climbed by 1.41% to $10.4275 per bushel, with a weekly increase of 5.70%, driven by a significant short-term surge following the USDA's monthly crop inventory report on August 12 [1] - Soymeal futures rose by 3.12% and soybean oil futures increased by 1.43% during the same period [1]