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Fig. 2.

Box-Whisker diagrams showing the δ15N (a) and δ18O (b) ranges of nitrate for inorganic fertilizer (IOF), plant-based compound fertilizer (PCF) and organic fertilizer (OF) collected from South Korea. 50% of data (interquartile, IQR) is expressed in a box, and lower and upper whiskers are defined by 5th percentile–1.5×IQR and 95th percentile+1.5×IQR, respectively.

Episodes 2019;42:313~319
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