| Clue | Source | Date |
|---|---|---|
| About 5, for coffee | LA Times Daily | 07 Sep 2019 |
| About 5, for coffee | The Washington Post | 07 Sep 2019 |
| About 5, for coffee | ||
| Soil acidity measure | The Washington Post | 05 Dec 2017 |
| Soil acidity measure | LA Times Daily | 05 Dec 2017 |
| Soil acidity measure | ||
| A soil scientist may measure it | Wall Street Journal | 24 Dec 2016 |
| Soil scientist's measure | New York Times | 10 Sep 2016 |
| Soil scientist's measure | ||
| Basic measurement | ||
| Soil test measure | ||
| Base measurement | ||
| Acidity or alkalinity | ||
| Acidity or alkalinity measurement, which is literally 8 for this puzzle's four longest answers | ||
| Acidity or alkalinity measurement, which is literally 8 for this puzzle's four longest answers | ||
| Base measurement |