Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
| Soil Characteristic | Standard measurement | Normalized for this study |
|---|---|---|
| Acidity | >7, 7, <7 | 1, 0, -1 |
| Bulk density | High, medium, low | 1, 0.5, 0 |
| Organic carbon content | Very high, high, medium, low, very low | 1, 0.66, 0.5, 0.33, 0 |
| Gypsum content | Yes, no | -1, 0 |
