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• Saturated Soil Paste for the Determination <br />of Water Solubles (Na, Ca, Mg and K), pH <br />Electrical Conductivity and Saturation $ <br />(USDA Handbook 60 - Modified) <br />Continued <br />Calculations: <br />meg/L = (ABSs- ABSBK) x dilution x concentration of standard <br />(~SSTD - ABSBK) x meg weight <br />Sodium Absorption Ratio (SAR) <br />SAR = [Na+] [Ca~J + [Mg#] <br />2 <br />Potassium Absorption Ratio (PAR) <br />PAR = [K+] [Ca ] + [Mg ] <br />2 <br />• Where concentration values are in meg/L <br />Exchangable Sodium Percentage (ESP) <br />ESP = (-0.0126 = 0.01475A) x 100 <br />1 + (-0.0126 + 0.01475A) <br />Where A = SAR <br />• <br />6-42 <br />