Soil Nutrient Tester for Determining Soil Nutrients in Hainan Province

China has a vast area and abundant soil resources. However, the quality of soil resources is closely related to the nutrient content of the soil. The use value and potential of soil resources are estimated. However, due to the limitations of scientific and technical conditions, the assessment of soil nutrients generally adopts qualitative assessment methods. Modern times are the era of information technology, and the research and application of soil increasingly depends on quantitative mathematical methods. The soil nutrient tester is gradually being paid attention to in the determination of soil nutrients.

Based on the data of the second national soil survey in 18 cities and counties in Hainan Province, the drawing of sampling point maps was carried out. Since there is no latitude and longitude coordinate data for the second soil survey sample, reference to previous studies used township-level administrative district maps to extract the center coordinates of each village as the location of sampling points in the village, using the nutrient content of all the samples in each village. The arithmetic mean value is used as the soil nutrient content of the sampling point.

The soil nutrient tester was used to use the soil sampling point comprehensive index spatial interpolation method. The method first determines the soil nutrient quality evaluation factors and their weights, and comprehensively scores the sampling points according to the obtained weights. The specific approach is to perform a simple grading process on the nutrient element content of each soil sampling point, and determine its score against the level and position in the corresponding grading table. After obtaining the single factor score for each index of each sample point, Combined with the weight coefficient of soil nutrient quality, according to the principle of multiplication and multiplication in fuzzy mathematics, that is, comprehensive evaluation index value (IFI) of soil nutrient quality, using IFI = ∑ (qi × wi) to calculate: where qi is the i The sub-degree value (ie, graded score) of the soil nutrient evaluation index, and wi is the weight coefficient of the i-th soil nutrient evaluation index. Under the support of GIS technology, spatial interpolation through points was expanded, spatial interpolation maps of comprehensive scores of soil nutrient quality were drawn with the expertise of soil science, and finally, each quality level was divided by clustering and reclassification.

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