| All areas are prime farmland |
| Farmland of local importance |
| Farmland of statewide importance |
| Farmland of statewide importance, if drained |
| Farmland of statewide importance, if drained and either protected from flooding or not frequently flooded during the growing season |
| Farmland of statewide importance, if irrigated |
| Farmland of statewide importance, if irrigated and drained |
| Farmland of statewide importance, if irrigated and either protected from flooding or not frequently flooded during the growing season |
| Farmland of statewide importance, if irrigated and reclaimed of excess salts and sodium |
| Farmland of statewide importance, if irrigated and the product of I (soil erodibility) x C (climate factor) does not exceed 60 |
| Farmland of statewide importance, if protected from flooding or not frequently flooded during the growing season |
| Farmland of unique importance |
| Not prime farmland |
| Prime farmland if drained |
| Prime farmland if drained and either protected from flooding or not frequently flooded during the growing season |
| Prime farmland if irrigated |
| Prime farmland if irrigated and drained |
| Prime farmland if irrigated and either protected from flooding or not frequently flooded during the growing season |
| Prime farmland if irrigated and reclaimed of excess salts and sodium |
| Prime farmland if protected from flooding or not frequently flooded during the growing season |
