We are having problem with the analyses of exchngeable cations in saline soils. What should be the best method to determine the exchangeable sodium or extractable sodium of higly saline soils?
Please have a look at this link.
https://www.researchgate.net/publication/43457697_Measurement_of_exchangeable_cations_in_saline_soils
Article Measurement of exchangeable cations in saline soils
Kindly see..
http://www.regional.org.au/au/asssi/supersoil2004/s6/oral/1670_soh.htm
See too plz..
https://books.google.co.in/books?id=EEBdquuIOCAC&pg=PA67&lpg=PA67&dq=Analyses+of+Exchangeable+Cations+particularly+Sodium+in+Saline+soils&source=bl&ots=V6AlADar8U&sig=EO4Nm3S8KXW3UKVgoX3zo_6uaLQ&hl=en&sa=X&ved=0ahUKEwjBvY2t8r_TAhXCRY8KHbo9CFgQ6AEIPjAD#v=onepage&q=Analyses%20of%20Exchangeable%20Cations%20particularly%20Sodium%20in%20Saline%20soils&f=false
Check this also..
http://www.tandfonline.com/doi/abs/10.1080/00103628709367872
See also..
https://books.google.co.in/books?id=W7K7xZx7N3YC&pg=PA668&lpg=PA668&dq=Analyses+of+Exchangeable+Cations+particularly+Sodium+in+Saline+soils&source=bl&ots=nIflblJ8__&sig=gRDZj3jIav2Vb23M3XpyZUlGSxY&hl=en&sa=X&ved=0ahUKEwjBvY2t8r_TAhXCRY8KHbo9CFgQ6AEIVTAJ#v=onepage&q=Analyses%20of%20Exchangeable%20Cations%20particularly%20Sodium%20in%20Saline%20soils&f=false
In saline soils , soil saturation paste Ece will give better prediction about the extent of soil salinity , since in saline soils, we need soluble slats to be flushed out ...
Hello Gunal ji,
In my view first you have to remove water soluble portion. Then go for exchangeable fractions.
Take 10 g of soil in CF and put 20 ml dist. water. shake and keep the flask for 20 min. The soluble portion will be appearing on top. Filter only that part and allow the soil to remain in flask. To this add 50 ml ammonium acetate, shake for 15 min. and extract . Estimate Na. This will be exchangeable Na.
Dr Rajakumar , you have provided an excellent piece of information . Such procedure is usually adopted in saline-sodic /sodic soil. In saline soil , presence of exchangeable sodium is not so important..
The determination of exchangeable sodium percent can be made following appropriate procedures in the laboratory, However, for routine analysis of large soil samples, this determination is too time consuming. Although the relationship between pH and ESP is complex when applied to a wide range of soils yet pH may be used as a satisfactory indication of exchangeabl sodium. For example pH(1:2) 8,5-9.2 = ESP 20, pH 9,2-9.4 = ESP 20-35, pH 9.4-9.7 = ESP 35-50, pH 9.7-9.8 = ESP 50-65....and so on. Since pH can be easily and rapidly determined in the laboratory, this parameter has widely be used to asses the degree of sodicity.
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