Sodium is closely monitored and regulated because of its toxic effects to soil texture and crops. High sodium concentrations disperses the soil's colloidal particles, rendering the soil hard and resistant to water penetration.

The build-up of osmotic pressure in soil due to high sodium concentration is characterized by poor tilth and hinders water absorption by plant roots. Sodium absorption ratio (SAR) along with pH is used to characterize salt-affected areas. High sodium content can be mitigated by distribution of gypsum directly on the soil or as an additive to irrigation water.

The HANNA® test kit determines Sodium Hazard in irrigation water by calculation of SAR in relation to Sodium, Calcium and Magnesium concentrations.

The kit is supplied with the DiST 4 Conductivity Tester, to quickly determine the conductivity of irrigation water. The kit's manual also supplies information about practical actions to help remedy adverse conditions.

• Method: DiST®4 + test kit
• Range: 0.0 meq/L
• Smallest Increment: 0.2 meq/L
• Chemical Method: Titration
• Number of Tests: approx 100
• Weight: 785 g