| Factor/Measurement | No. fields |
| Previous crop |
|
| Hordeum vulgare L. (Barley) | 4 |
| Brassica napus L. (Canola) | 1 |
| Zea mays L. (Corn) | 1 |
| Phaseolus vulgaris L. (Dry bean) | 2 |
| Triticum aestivum L. (Hard red spring wheat) | 7 |
| Triticum aestivum L. (Hard red winter wheat) | 1 |
| Pisum sativum L. (Pea) | 1 |
| Glycine max L. (Soybean) | 21 |
| Tillage type |
|
| Conventional | 21 |
| Minimum | 2 |
| No-Till | 8 |
| Vertical | 5 |
| Residue (%) |
|
| 0 - 10 | 3 |
| 11 - 20 | 8 |
| 21 - 30 | 12 |
| 31 - 40 | 6 |
| 41 - 50 | 1 |
| 51 - 60 | 2 |
| 61 - 70 | 3 |
| 71 - >80 | 3 |
| Soil moisture† |
|
| Dry | 1 |
| Moist | 31 |
| Soggy | 6 |