SOILS
| Date | Clue |
|---|---|
| 2026-06-04 | Nursery purchases |
| 2024-11-05 | Tarnishes |
| 2023-09-02 | Gets dirty |
| 2021-04-18 | Taints |
| 2017-02-26 | Muddies |
| 2015-11-12 | Besmirches |
| 2015-03-07 | Their pH's are often measured |
| 2014-03-10 | Dirties |
| 2011-11-20 | Besmirches |
| 2009-02-01 | Agronomists' samples |
| 2009-01-18 | Makes a mess of |
| 2007-02-08 | Muddies |
| 2005-11-11 | Agronomists' study |
| 2005-06-12 | Dirties |
| 2005-03-02 | Taints |
| 2004-12-06 | Dirties |
| 2002-07-21 | Besmirches |
| 2001-02-27 | Besmirches |
| 1999-06-04 | Agronomists' study |