PhilRice

Soil Series

Information System

0-20
20-57
57-84
Isabela Series
Soil Fertility High
Soil pH Neutral (7.0
Organic Matter Moderate
Phosphorus (P) High
Potassium (K) High
Nutrient Retention High
Base Saturation High
Salinity Hazard Low
Physical Soil Quality
Relief Level
Water Retention Very high
Drainage Poor to moderate
Permeability Slow
Workability/Tilth Hard to moderate
Stoniness None
Rooting Depth Deep (>1 m)
Flooding Seasonal river flooding
Erosion None
Surface Soil Type: Clay/Sandy loam
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 and exhibits 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