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Fig. 4.

Plot of δ15N and δ18O values of nitrate from previous studies (Lee et al., 2008; Koh et al., 2010; Choi et al., 2011; Cheong et al., 2012; Shin et al., 2014; Kim et al., 2015; Kaown et al., 2018) in South Korea superimposed on the revised fields of nitrate from fertilizers determined in this study. Main factors determining the isotopic ranges were shown in italic.

Episodes 2019;42:313~319 https://doi.org/10.18814/epiiugs/2019/019025
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