What is the principle of burning fire and earth!

Farmers shovel turf and burn fire soil in autumn and winter. First, they obtain the fire soil ash that has burned all weed seeds, hibernating pests, their eggs, and pathogens as fertilizer; second, they cover it with fire soil ash. Crop seeds and seedlings can protect and promote production by exerting their functions of keeping warm, retaining water and being breathable.

However, shoveling turf cannot destroy surface vegetation, especially on hillsides. It has been measured that after turf is shoveled on a hillside with a slope of more than 15 degrees, the thickness of the soil surface layer lost within one year will reach 0.77 centimeters. What was obtained was fire and soil ashes that had burned away all the organic matter. Its fertilizer content is very limited. In addition, in autumn, winter or early spring when fires are burning, the weather is dry, there are many combustible materials such as fallen leaves and dry grass, and fires often burn overnight, so forest fires are easily triggered in hills and mountainous areas. There is a danger of burning large tracts of forest. This phenomenon was not uncommon in the past. Why are there so many hills on both sides of highways, rural roads, and fields that are so bare and barren of grass? It is caused by people repeatedly shoveling away the turf, causing a lot of soil erosion. In some places, there is even no grass to feed cattle. The lessons of this destruction of ecological balance are profound.