Peat soil is made from fallen leaves, weeds, etc. that have decayed over a long period of time and complex physical and chemical changes in large forests in Northeast China. It is currently the most ideal soil covering material for Agaricus bisporus production. Agaricus bisporus factory cultivation is widely used in developed countries such as the Netherlands and Italy. In our country, especially in traditional Agaricus bisporus production areas such as Fujian and Zhejiang, peat soil is rarely used due to lack of resources and insufficient awareness. With the continuous advancement of science and technology, the continuous increase of market prices, and the standardization, industrialization, factoryization and professional development of Agaricus bisporus production in various places, peat soil has gradually become an important production-increasing measure and has been accepted by mushroom farmers. Among them, the most typical one is Shandong Jiufa factory cultivation, which represents internationally advanced production technology. Since it was completed and put into operation in 1995, peat soil has been used as the covering material, with an average output of more than 30 kilograms per square meter.

The reason why peat soil has such a yield-increasing effect as a covering material is that it has a unique physical structure: a loose structure, strong water-holding capacity, and large porosity, which makes it difficult for water to penetrate the material and form a "sandwich" ". In the growth management process of Agaricus bisporus, water management is the key to the yield. There is a saying that "one pound of water, one pound of mushrooms". However, it is difficult to achieve effective water control in ordinary field soil, especially sandy soil, and the water is easy to penetrate. The material is low in water and hardened, and the mushroom body has low water content, making it difficult to obtain high yields. Second, peat soil is rich in nutrients and minerals: it can speed up the mycelium to "climb into the soil", twist and produce mushrooms, greatly increase the content of mycelium in the soil layer, enhance the vitality of mycelium, and accelerate the nutrients in the culture medium. Transformation and transportation to promote balanced supply of nutrients during fruiting body formation. Research has also proven that peat soil contains some special substances and beneficial microorganisms that can promote the transformation of mycelium into fruiting bodies.

The peat soil used as covering soil for Agaricus bisporus can be used many times. After the cultivation of Agaricus bisporus in one season, the peat soil should be collected as much as possible and piled outdoors. When it is used in the next season, insecticides and fungicides should be sprayed for thorough treatment before use.