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Irrigation water quality guidelines - USDA

(WQ 8) Section 2 of 22 (2k - Irrigation water quality guidelines1) Potential Irrigation water quality problem Parameter Degree of restriction on use None Slight to moderate Severe Salinity (affects crop water availability) ECiw (mmho/cm) < > or TDS (mg/l) < 450 450 2,000 > 2,000 Infiltration (affects water infiltration rate, evaluated by using ECiw and SAR together) SAR ECiw (mmho/cm) 0 3 3 6 6 12 12 - 20 20 - 40 > > > > > < < < < < Specific ion toxicity (affects sensitive crops) (Na+) surface Irrigation sprinkler Irrigation (Cl-) surface Irrigation sprinkler Irrigation Boron (B) SARadj meq/l meq/l meq/l ppm/l < 3 < 3 < 4 < 3 < 3 - 9 > 3 4 10 > 3 > 9 > 10 > (HCO3-) Bicarbonate (overhead sprinkler only) meq/l < > Plugging potential from

(WQ – 8) Section 2 of 22 (2k - Irrigation water quality guidelines1) Potential irrigation water quality problem Parameter Degree of restriction on use

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