Soil Science and Management

4.

Soil Water Relations

4.1.

Properties of Water

4.1.1.

Molecular Structure

4.1.2.

Polarity and Hydrogen Bonding

4.1.3.

Cohesion and Adhesion

4.1.4.

Surface Tension

4.1.5.

4.2.

Soil Water Content

4.2.1.

Methods of Expression

4.2.1.1.

Gravimetric Water Content

4.2.1.2.

Volumetric Water Content

4.2.2.

Soil Moisture States

4.2.2.1.

4.2.2.2.

4.2.2.3.

Permanent Wilting Point

4.2.2.4.

4.2.2.5.

4.3.

Soil Water Energy Concepts

4.3.1.

Soil Water Potential

4.3.1.1.

Components of Water Potential

4.3.1.1.1.

Matric Potential

4.3.1.1.2.

Osmotic Potential

4.3.1.1.3.

Gravitational Potential

4.3.1.1.4.

Pressure Potential

4.3.2.

Water Retention Curves

4.3.2.1.

Construction and Interpretation

4.3.2.2.

Hysteresis Effects

4.4.

Forms of Soil Water

4.4.1.

Gravitational Water

4.4.2.

Capillary Water

4.4.3.

Hygroscopic Water

4.4.4.

4.5.

Plant Available Water

4.5.1.

Available Water Capacity

4.5.2.

Readily Available Water

4.5.3.

Factors Affecting Availability

4.5.3.1.

4.5.3.2.

4.5.3.3.

4.5.3.4.

4.6.

Water Movement in Soil

4.6.1.

4.6.1.1.

4.6.1.2.

Hydraulic Conductivity

4.6.1.3.

Factors Affecting Saturated Flow

4.6.2.

Unsaturated Flow

4.6.2.1.

4.6.2.2.

Hydraulic Conductivity Functions

4.6.3.

4.6.3.1.

Infiltration Process

4.6.3.2.

Factors Affecting Infiltration

4.6.3.3.

Measurement Methods

4.6.4.

Evapotranspiration

4.6.4.1.

Evaporation from Soil

4.6.4.2.

Plant Water Uptake

4.6.4.3.

Factors Affecting ET

4.7.

Measurement of Soil Water

4.7.1.

4.7.1.1.

Gravimetric Method

4.7.1.2.

Neutron Scattering

4.7.1.3.

Time Domain Reflectometry

4.7.2.

Indirect Methods

4.7.2.1.

4.7.2.2.

Electrical Resistance Blocks

4.7.2.3.

Heat Dissipation Sensors

Previous

3. Soil Physical Properties

Go to top

Next

5. Soil Chemistry and Mineralogy