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Estimating Exchangeable Sodium Percentage from Sodium Adsorption Ratio of Salt-Affected Soil in the Songnen Plain of Northeast China[J] CHI Chun-Ming 1;2;ZHAO Chang-Wei 1;2;SUN Xiao-Jing 1 and WANG Zhi-Chun 1;2 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) Pedosphere 2011, 02
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