In the comprehensive evaluation of soil moisture in a certain area, there are usually three steps: soil sampling, soil moisture measurement analysis, soil moisture evaluation standards and methods. The instruments involved include: soil analyzers, soil moisture meters and other scientific instruments. Today we talk about sampling and testing in comprehensive soil moisture evaluation. The sampling method directly affects the objectivity of the evaluation results. The soil moisture meter accurately measures the soil moisture. How to sample and determine the sampling density is a difficult point in the water evaluation. There is no uniform standard. Different sampling methods are used in different regions. Mathematical methods to explore more scientific sampling techniques will be the focus of future research. There are many researches on the selection of soil evaluation indicators, but there are few research reports on the selection of tobacco soil water evaluation indicators. There are certain differences in the selection of evaluation indicators in the relevant studies of different tobacco areas, which is different from the soil moisture status of different tobacco areas. There is a certain relationship. Scientists used the results of previous studies and combined with the water conditions in the study area to determine the indicators of soil moisture. There are many methods for evaluating soil moisture. At present, the merits and demerits of different evaluation methods are still inconclusive. This study adopted a fuzzy comprehensive evaluation method. The determination of thresholds and weights of soil moisture indicators in this method are two key issues that are directly related to the accuracy of the evaluation results. In this study, the threshold of each moisture index was determined by reference to the existing research results and the local standards of the tobacco area. The weight of each moisture index was calculated using the analytic hierarchy process. On the basis of fuzzy comprehensive evaluation, the introduction of GIS technology to achieve the visualization of the evaluation results can be a quick, scientific and effective comprehensive evaluation of crop soil moisture suitability. It must be pointed out that the results of soil water suitability evaluation of crops only represent the potential productivity of crop soils in the region, and the factors such as climate, topography, landforms, and production techniques must be comprehensively considered in order to more accurately reflect the actual productivity of the tobacco fields. The sampling points for soil moisture are mainly based on the distribution of basic farmland. Although this method takes into account the spatial distribution of basic farmland and the distribution of flue-cured tobacco production in the region, the requirement for uniform distribution of sampling points in geostatistical analysis is less considered and will need to be improved in future studies; in addition, the sampling of this study The density is large, but its rationality is not tested. The more samples theoretically involved in the evaluation, the higher the evaluation accuracy. However, due to the cost of collecting and analyzing soil samples, the sampling density cannot and does not need to be unlimited. . Therefore, determining a reasonable sampling density is very important for accurately assessing the spatial variability of soil nutrients and saving resources.
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