Sodic soil

Sodic soil or soil sodicity may refer to:

• (Sodic) saline soil, a soil with excess salts where sodium chloride (NaCl) predominates. Soils vary depending on various chemicals present.
• (Sodic) alkaline soil, a soil with a high pH (>8.5) due to the presence of excessive sodium carbonate (Na₂CO₃)

Sodic soils are characterized by a disproportionately high concentration of sodium (Na) in their cation exchange complex. They are usually defined as containing an exchangeable sodium percentage greater than 15%. These soils tend to occur within arid to semiarid regions and are innately unstable, exhibiting poor physical and chemical properties, which impede water infiltration, water availability, and ultimately plant growth.