Salinity Management Calculator

Calculate leaching requirement from irrigation water EC and crop salt tolerance using FAO guidelines, plus SAR and salinity hazard assessment.

Irrigation water EC (dS/m)

Crop EC threshold (dS/m)

Seasonal crop ET (in)

Field size (acres)

Sodium (meq/L)

Calcium (meq/L)

Magnesium (meq/L)

Target yield (%)

System efficiency (%)

Tab to move between fields

Leaching requirement (%)

16.4

Total water with leaching (in)

33.8

Gross irrigation needed (in)28.2

Extra leaching water (in)5.6

Total water (acre-ft)281.6

Leaching water (acre-ft)46.3

Est. drain water EC (dS/m)7.3

Sodium Adsorption Ratio (SAR)3.2

SAR hazard (1-4)1

Salinity hazard (1-4)2

Est. TDS (ppm)768

Salt loading (tons/acre/yr)2.08

How to Use This Calculator

Enter Irrigation water EC (dS/m), Crop EC threshold (dS/m), and Seasonal crop ET (in).
Set Field size (acres), Sodium (meq/L), and Calcium (meq/L).
Adjust Magnesium (meq/L), Target yield (%) as needed.
Review Leaching requirement (%) and Total water with leaching (in).
Use Gross irrigation needed (in) and Extra leaching water (in) to inform your decision.

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