Editing Nanjing (section)

=== Soil ===
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There are mainly two types of soil in Nanjing: zonal soil and cultivated soil. The zonal soil is yellow-brown soil in the northern and central areas of Nanjing, and red soil in the southern part of the border with Anhui. The cultivated soil formed by human-made farming is mainly paddy soil, and there are some yellow Gang soil and vegetable garden soil. The distribution of soil presents a certain law with the undulation of topography and hydrological conditions, which can be divided into three categories: low mountain and hilly area, hilly area and plain area. According to the second national soil survey from 1980 to 1987, the soil in Nanjing is divided into 7 soil types, 13 subtypes, 30 soil genera and 66 soil species, with a total area of 416,300 hectares.