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The soil nutrient indexes of Guangxi Camellia oleifera were systematically studied by the relevant instrumentation application of soil nutrient fastness tester. The results showed that: except soil pH value, total potassium, available nitrogen, effective copper, available zinc, and effective iron, six indices were moderately variable. The other 9 indicators are strong variability; the soil pH, organic matter, total nitrogen, available copper, and effective iron content have medium spatial correlation, and the remaining indicators have poor spatial correlation, which may be related to the topographic conditions of the Camellia oleifera plantation.
Due to the scattered distribution of soil samples and the large scale of research, the analysis results of soil nutrient fastness instrument are only used as a reference for the suitability planning of Camellia oleifera in the entire Guangxi region and cannot be used as the basis for county-level planting planning. In addition, because of the lack of land use data in the region, the plots that do not allow the cultivation of Camellia oleifera could not be removed in the study. Therefore, the specific area of ​​each suitable zone could not be given and will be further improved in future studies.
Camellia oleifera was planted in hilly areas about 500m above sea level. Soil maternal matter was more complicated. Different levels of Camellia oleifera tend to have different tending levels. The analysis of soil nutrient fastness meter may lead to differences in the nutrient indexes between Camellia oleifera production areas in Guangxi. Strong, showing strong nutrient variability and poor spatial correlation.
Analysis of Spatial Structure of Soil Nutrient Analyzer
To screen soil nutrient indexes related to the yield and quality of Camellia oleifera, the 15 nutrient indexes of Camellia oleifera were related to six oil quality indexes of Camellia oleifera oil content, palmitic acid, stearic acid, oleic acid, linoleic acid, and fresh fruit weight. Based on the results of correlation analysis of soil nutrient fastness testers, a nutrient index that is sensitive to the quality of camellia was selected as an evaluation index.