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Published online 2 June 2005
Published in Soil Sci Soc Am J 69:1146-1151 (2005)
DOI: 10.2136/sssaj2004.0267
© 2005 Soil Science Society of America
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Soil Salinity Using Saturated Paste and 1:1 Soil to Water Extracts

H. Zhanga, J. L. Schrodera,*, J. J. Pittmana, J. J. Wangc and M. E. Paytonb

a Dep. of Plant and Soil Sciences, Oklahoma State Univ., Stillwater, OK 74078
b Dep. of Statistics, Oklahoma State Univ., Stillwater, OK 74078
c Dep. of Agronomy, Louisiana State Univ., Baton Rouge, LA 70803



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  		Fig. 1. Relationship between electrical conductivity (EC) of saturated paste and 1:1 soil/water extracts for 170 study soils. ***P < 0.001. The dashed lines represent the 95% confidence interval for the regression.

 


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  		Fig. 2. Relationship between electrical conductivity (EC) of saturated paste predicted with measured 1:1 soil/water extract and USDA regression equation or OSU regression equation and actual measured EC of saturated paste for 22 random soils. **P < 0.01.

 


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  		Fig. 3. Relationship between (A) Na+ predicted by OSU and USDA regression equations and measured Na+ in saturated paste extracts for 22 random soils and (B) Cl– predicted by Oklahoma State University study and USDA regression equations and measured Cl– in saturated paste extracts for 22 random soils. **P < 0.01.

 


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  		Fig. 4. Relationship between (A) Ca2+ predicted by Oklahoma State University study (OSU) and USDA regression equations and measured Ca2+ in saturated paste extracts for 22 random soils and (B) SO42– predicted by OSU and USDA regression equations and measured SO42– in saturated paste extracts for 22 random soils. **P < 0.01.

 




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