The cover soil.
Methods for soil microbial fertility If the bare ground to make microbes die. The tree will not be able to grow be clothed with soil. The king bestowed the Royal in the care and treatment of soil one way, is "clad soil" to the soil moisture microorganisms work well. This will result in the soil that area agriculture effectively. To prevent the erosion of the soil. And development of soil resource to minerals.
The cover soil has many methods, such as using straw and leaf debris to cover soil. Or other materials as determined by the general conditions of the area.