The Loess Plateau used to be rich in vegetation and covered with big trees, but now there are thousands of gullies and no trees, which is the painful result of water scouring the earth after the destruction of vegetation
Raw soil is the evil consequence of soil erosion and lacks the nutrients needed for plant growth.
 Some experts further analyze and believe that the reason why plants do not grow on the Loess Plateau is that the loess here is actually raw soil