0-20
20-57
57-84
Isabela Series
| Soil Fertility | High |
|---|---|
| Soil pH | Slightly acid to neutral (5.0-7.2) |
| Organic Matter | Moderate |
| Phosphorus (P) | High |
| Potassium (K) | High |
| Nutrient Retention | High |
| Base Saturation | High |
| Salinity Hazard | None |
| Physical Soil Quality | |
|---|---|
| Relief | Level to nearly level |
| Water Retention | Very high |
| Drainage | Poor |
| Permeability | Slow |
| Workability/Tilth | Hard to moderate |
| Stoniness | None |
| Rooting Depth | Deep (>1m) |
| Flooding | Seasonal |
| Erosion | None |
Surface Soil Type: Clay
Family name: Fine, smectitic (ca.), isohyperthermic, Aquic Hapludalf
Soil formed from alluvial deposits and is well traversed by big rivers It is fine textured with less than 60 composed mostly of minerals which have shrink and swell capacity smectitic It is an old soil with high base status and an alluvial accumulation of clay in the subsoil horizons from underlying horizons alf Alfisol has minimum complexity in its horizonation Hapl It is saturated with water for repeated periods of time aquic It is found in areas with humid climate that have well distributed rainfall ud udic with 7 months wet and 3 months dry thus have an adequate supply of moisture for crop growth The mean annual soil temperature is higher than 22C isohyperthermic