美国农业部（USDA）在每周作物生长报告中公布称，截至2021年8月15日当周，美国大豆优良率为57%，之前一周为60%，去年同期为72%。
当周，美国大豆开花率为94%，之前一周为91%，去年同期为95%，五年均值为94%；美国大豆结荚率为81%，之前一周为72%，去年同期83%，五年均值79%。
| 日期 | 优良率 | 去年同期 | 五年均值 | 开花率 | 去年同期 | 五年均值 | 结荚率 | 去年同期 | 五年均值 |
| 2021/6/27 | 60% | 71% | - | 14% | 13% | 11% | - | - | - |
| 2021/7/4 | 59% | 71% | - | 29% | 29% | 24% | 3% | 2% | 3% |
| 2021/7/11 | 59% | 68% | - | 46% | 46% | 40% | 10% | 10% | 10% |
| 2021/7/18 | 60% | 69% | - | 63% | 62% | 57% | 23% | 23% | 21% |
| 2021/7/25 | 58% | 72% | - | 76% | 74% | 71% | 42% | 40% | 36% |
| 2021/8/1 | 60% | 73% | - | 86% | 84% | 82% | 58% | 57% | 52% |
| 2021/8/8 | 60% | 74% | - | 91% | 91% | 89% | 72% | 73% | 68% |
| 2021/8/15 | 57% | 72% | - | 94% | 95% | 94% | 81% | 83% | 79% |
