Pedosphere 21(2): 271--276, 2011
ISSN 1002-0160/CN 32-1315/P
©2011 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Estimating exchangeable sodium percentage from sodium adsorption ratio of salt-affected soil in the Songnen Plain of Northeast China |
CHI Chun-Ming1,2, ZHAO Chang-Wei1,2, SUN Xiao-Jing1 and WANG Zhi-Chun1 |
1 Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012 (China)
2 Graduate University of Chinese Academy of Sciences, Beijing 100049 (China) |
| ABSTRACT |
| Soil exchangeable sodium percentage (ESP) and sodium adsorption ratio (SAR) are commonly used to assess soil sodicity.Correlation between ESP and SAR of saturated pasted extract (SARe) or of 1:5 (m:m) mixture soil to water (SAR1:5) has been documented to predict ESP from SAR.However limited studies have been undertaken to model soil ESP based on soil SAR in the Songnen Plain,Northeast China.In this study,117 soil samples were used to predict ESP from SARe and SAR1:5 of salt-affected soils in western Songnen Plain.Soil ESP was highly related (r2 > 0.76,P < 0.001) with SARe and SAR1:5.ESP of salt-affected soils in the Songnen Plain could be predicted using a logarithmic regression equations of ESP=10.72·ln (SARe) 15.36 and ESP=11.44·ln (SAR1:5) + 5.48. |
| Key Words: ESP, SAR, saturated paste extract, soil salinity, soil sodicity |
| Citation: Chi, C. M., Zhao, C. W., Sun, X. J. and Wang, Z. C. 2011. Estimating exchangeable sodium percentage from sodium adsorption ratio of salt-affected soil in the Songnen Plain of Northeast China. Pedosphere. 21(2): 271-276. |
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