芝加哥大豆油期货周四跌产后阿2.4%，7月份仍涨超4.2%，玉米、小麦、大豆均累跌超3%

Group 1 - The Bloomberg Grain Index remained stable at 29.0800 points, with a cumulative decline of 3.45% in July, having peaked at 31.1776 points on July 3 before experiencing a significant drop [1] - The index fluctuated around the psychological level of 30 points from July 7 to July 23, followed by a smooth decline, reaching 28.8439 points on July 31 [1] Group 2 - CBOT corn futures increased by 0.36% to $4.1375 per bushel, with a cumulative decline of 3.10% in July [2] - CBOT wheat futures rose by 0.05% to $5.24 per bushel, with a cumulative decline of 3.37% in July [2] - CBOT soybean futures decreased by 0.55% to $9.9025 per bushel, with a cumulative decline of 3.37% in July; soybean meal futures increased by 0.66% with a cumulative decline of 4.26%, while soybean oil futures fell by 2.42% but had a cumulative increase of 4.23% in July [2]