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| Hays, KS | Colby, KS | ||
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| 2011 | 2012 | 2011 | 2012 |
| Geographic location | West-central Kansas | Northwest Kansas | ||
| Soil type | Roxbury silt loam | Crete silty clay loam | Keith silt loam | Keith silt loam |
| Soil pH | 7.8 | 6.1 | 7.2 | 7.2 |
| Organic matter (%) | 2.0 | 1.8 | 2.0 | 2.0 |
| Sunflower hybrid | Mycogen 8N358CLDM | Mycogen 8N421CLDM | Mycogen 8N358CLDM | Mycogen 8N358CLDM |
| Seed rate (Seeds∙ha−1) | 49,000 | 49,000 | 57,575 | 57,575 |
| Planting date | 6/17/2011 | 6/11/2012 | 6/14/2011 | 6/06/2012 |
| Herbicide application date | 6/20/2011 | 6/12/2012 | 6/15/2011 | 6/06/2012 |