Soil Science

  1. Soil Physical Properties
    1. Soil Texture
      1. Soil Separates
        1. Sand
          1. Size Range
          2. Silt
            1. Size Range
            2. Clay
              1. Size Range
            3. Textural Classes
              1. Loam
                1. Sandy Loam
                  1. Clay Loam
                    1. Silty Clay
                      1. Other Textural Classes
                      2. The Textural Triangle
                        1. Using the Triangle
                          1. Interpreting Textural Classes
                          2. Determining Soil Texture
                            1. Field Methods
                              1. Feel Method
                                1. Ribbon Test
                                2. Laboratory Methods
                                  1. Hydrometer Method
                                    1. Pipette Method
                                3. Soil Structure
                                  1. Definition and Importance
                                    1. Types of Soil Structure (Peds)
                                      1. Granular
                                        1. Platy
                                          1. Blocky
                                            1. Angular Blocky
                                              1. Subangular Blocky
                                              2. Prismatic
                                                1. Columnar
                                                2. Formation of Aggregates
                                                  1. Role of Organic Matter
                                                    1. Role of Clay and Oxides
                                                    2. Stabilization of Aggregates
                                                      1. Biological Activity
                                                        1. Cementing Agents
                                                      2. Soil Color
                                                        1. Causes of Soil Color
                                                          1. Organic Matter Content
                                                            1. Iron Oxides
                                                              1. Manganese Oxides
                                                                1. Moisture Status
                                                                2. The Munsell Color System
                                                                  1. Hue
                                                                    1. Value
                                                                      1. Chroma
                                                                      2. Interpreting Soil Color
                                                                      3. Soil Density and Porosity
                                                                        1. Bulk Density
                                                                          1. Measurement Methods
                                                                            1. Factors Affecting Bulk Density
                                                                            2. Particle Density
                                                                              1. Typical Values
                                                                                1. Calculation
                                                                                2. Soil Porosity
                                                                                  1. Total Porosity
                                                                                    1. Pore Size Distribution
                                                                                      1. Macropores
                                                                                        1. Micropores
                                                                                    2. Soil Consistence
                                                                                      1. Consistence at Different Moisture Levels
                                                                                        1. Wet Consistence
                                                                                          1. Stickiness
                                                                                            1. Plasticity
                                                                                            2. Moist Consistence
                                                                                              1. Friability
                                                                                              2. Dry Consistence
                                                                                                1. Hardness
                                                                                              3. Measurement and Description
                                                                                              4. Soil Temperature
                                                                                                1. Factors Influencing Soil Temperature
                                                                                                  1. Solar Radiation
                                                                                                    1. Soil Color
                                                                                                      1. Moisture Content
                                                                                                        1. Vegetative Cover
                                                                                                        2. Effects on Plant Growth
                                                                                                          1. Effects on Microbial Activity
                                                                                                          2. Soil Water
                                                                                                            1. Soil Water Content
                                                                                                              1. Gravimetric Method
                                                                                                                1. Volumetric Method
                                                                                                                2. Soil Water Potential
                                                                                                                  1. Matric Potential
                                                                                                                    1. Osmotic Potential
                                                                                                                      1. Gravitational Potential
                                                                                                                      2. Plant Available Water
                                                                                                                        1. Field Capacity
                                                                                                                          1. Permanent Wilting Point
                                                                                                                            1. Available Water Range
                                                                                                                            2. Water Movement in Soil
                                                                                                                              1. Saturated Flow
                                                                                                                                1. Unsaturated Flow
                                                                                                                                  1. Infiltration
                                                                                                                                    1. Percolation
                                                                                                                                      1. Capillarity

                                                                                                                                  Previous

                                                                                                                                  3. The Soil Profile and Horizons

                                                                                                                                  Go to top

                                                                                                                                  Next

                                                                                                                                  5. Soil Chemical Properties