Does anyone know the standard quality guidelines for anions and cations from a reliable source, and can they recommend agricultural standards for the following parameters? Cations: Ca, Mg, Na, K %Na, SAR (Sodium Adsorption Ratio), TH (Total Hardness), EC (Electrical Conductivity), TDS (Total Dissolved Solids), pH Anions: CO₃²⁻, HCO₃⁻, Cl⁻, SO₄²⁻

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