| Summary: | The purpose of this study was to construct a map of expected fertilization rates for nitrogen (N) and phosphorus (P<sub>2</sub>O<sub>5</sub>) based on measurements of components in soil samples and to identify the spatial variabilities of four lots of a salt-affected paddy field in Korea. Four salt-affected paddy field lots in Korea were divided into 30 sectors for collecting soil samples. They were then analyzed for soil organic matter (SOM), silicon dioxide (SiO<sub>2</sub>), total nitrogen (TN), and available phosphorus (Av.P<sub>2</sub>O<sub>5</sub>) in accordance with international standards. Expected fertilization rates of N and P<sub>2</sub>O<sub>5</sub> were developed as prescription standards for the application of fertilizer to paddy fields. They were derived using a model of the fertilization rates of N and P<sub>2</sub>O<sub>5</sub>. To determine the presence of spatial correlation and continuity in the given fields, a spherical variogram was used. Based on the spherical model with the application of a regular kriging interpolation, maps of the contents of TN and Av.P<sub>2</sub>O<sub>5</sub> as well as the expected fertilization rates of N and P<sub>2</sub>O<sub>5</sub> at each sector of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>1</mn><mo>×</mo><mn>1</mn><mo> </mo></mrow></semantics></math></inline-formula> m<sup>2</sup> were developed. The expected fertilization rate of N at each sector appeared in the range of min. 10.0 g to max. 25.7 g, while that of P<sub>2</sub>O<sub>5</sub> appeared in the range of min. 0.68 g to max. 8.46 g.
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