| Impact ID | 7964 |
| Impact Type | Commerce |
| Study Type | Observational |
| Study Location | Field |
| Impact Description | The longer Echinochloa crus-galli (barnyard grass) is allowed to grow with a desired crop species, the greater the reduction in yield. |
| Reference | 24907 |
| Cost | |
| Location | United States Cotton Research Station, Shafter, California |