Understanding the Sodium Adsorption Ratio (SAR)

Understanding the Sodium Adsorption Ratio (SAR): How do salinity, calcium, magnesium, and sodium affect soil water infiltration and management decisions? This is an advanced animation for instructors, teachers, or other professionals. It explains the effects of the three ions of concern along with the salinity of the soil.

The Olsen Test for Phosphorus

The Olsen Test for Phosphorus: This animation makes the case for why soils with alkaline pH should be tested for plant-available phosphorus using the Olsen method. This should be a commonly used procedure in most western soils.

Unavailability of Water in Saline Soils

Unavailability of Water in Saline Soils: Salts in the soil provide nutrients to plants. However, an excess of salt can interfere with water uptake. This animation demonstrates how sodium chloride in soil binds with water and impedes roots from taking up water.