This kind of clay contains little sand, and it is very sticky, so it is difficult for water to pass through. Clay is plastic, including kaolin and hydrated kaolin, and its particles are very small. There is such white clay 600 meters underground. The black color of black soil is actually humus, which is an organic carbon-containing compound. This kind of soil is rich in organic matter and forms a benign aggregate structure with other components of the soil, which can not only provide certain air permeability, but also preserve water and fertilizer, which is beneficial to the survival of some bacteria and help plants grow well. The source of humus is litter and organic matter brought by water flow. Some places in the south burn wasteland on newly reclaimed land because there is more humus there.
If you can hit the upper, middle and upper feng shui acupoints on the five-color soil, you can hit the nine-color soil as the first-class feng shui.
Yangzuzu tomb