1.Choosing a place to plant mushrooms in a shed paddy field is to use the idle winter paddy field after rice harvest to grow mushrooms. When the rice seeds are scattered, the paddy field water is drained, and the soil preparation is started as follows: 2 furrows and 3 compartments, the middle compartment 1.5 m, the side compartment 1 m, the width of the compartment ditch is 0.3 m, the depth is 0.3 m, and the length is 10~ 15 m; 3-ditch hatchback type, with a width of1.5m and a trench width of 0.3m.. When making a box, dig out the fields in the ditch and base them on the side of the box to form a ridge to block the culture materials. The compartment ditch is also used as a walkway and drainage for operators. A herringbone shed was built on the car surface, and the middle of the herringbone shed was supported by bamboo or wooden sticks to form a middle column of the shed, which was 2.4 meters high. The pillars are connected by large bamboo poles to form a top beam. Cover the top beam with plastic film and straighten both sides into a natural triangle. Then the thin rice and wheat straw is sandwiched into a large hair fan with heavy duty and placed on the top beam to shade the light. You can also use black plastic film, after passing through the top beam, stretch on both sides to form a herringbone triangular shed, without using a hair fan to shade. The two ends of the herringbone shed are shaded by grass curtains. The drainage ditch around the shed should be well done.

2. The formula of fermentation culture medium is the same as that of indoor mushroom cultivation. Primary fermentation and secondary fermentation can be used. The outdoor secondary fermentation method uses natural high temperature in early autumn to achieve the effect of secondary fermentation without fuel heating, which reduces the production cost. The method is to use bricks and stones as cushion piers, which are about 20 cm high. Put a wooden stick on the hot pier, and put bamboo pieces on the wooden stick, especially like a bedstead, to make a base with a width of 1.5 meters and an indefinite length. Adjust the pre-fermented material pile to 5-6 drops of water by hand, and then adjust the pH value to 7.8-8 with lime powder. Then the culture is piled on the base, and wooden sticks or bamboo are preset to form air holes. The material is piled up to a height of 0.8~ 1 m, and the vent hole is made into a T-shape. When the material is piled up, the wooden stick or bamboo is pulled out, which naturally becomes a cavity and serves as a channel for air exchange in the material. Use 0.5% dichlorvos or dicofol to spray the surface of the pile to kill insects. Then build a simple frame with bamboo around the pile, about 20 cm away from the pile, to prevent the plastic film from sticking directly to the culture material and affecting the fermentation. Finally, cover with a film. The temperature of the pile is rapidly increased to above 62℃ by making full use of the sunlight during the day and the fermentation heat accumulated in the pile. When the high temperature is over, the temperature shall be reduced by 1~2℃ every day and ventilated for 3~4 times for 30 minutes each time. When the temperature is controlled at about 50℃, the fermentation is finished in 6~7 days, and finally the temperature is lowered below 45℃, the material can be moved into the herringbone shed.

3. Spreading and sowing: Two days before the materials enter the shed, all the cultivation beds are sprayed with 0.5% dichlorvos to kill insects, and the cultivation materials are ready to enter the shed. When the culture material is spread on the bed surface in the shed, the water content of the material should be controlled at 63%~65%, and it is appropriate to pinch 1 drop of water by hand, and the pH value of the material is 7~7.5, without ammonia smell. The paving thickness is 13~ 17 cm, and the paving and mixing are carried out with even strength. After the material is laid, the temperature of the material should be measured by thermometer. If the material temperature is below 28℃, it is prudent to sow. More seeds are planted in shifts, and each bottle can sow 0.7~0.8 square meters. Before sowing, operators disinfect their hands, tools and strain bottles with 0. 1% potassium permanganate. When sowing, use 2/3 of the strain to spread on the surface of the culture material, then stir it by hand to the surface of the material, then spread the remaining 1/3 of the seed on the surface of the material, and gently compact it with a clean board.

4. Management of spawning and fruiting Within 3 days after sowing, the herringbone shed should be closed, and the two ends of the shed should be covered tightly with straw curtains to keep warm and moisturize, so as to promote the germination and feeding of strains. After 3 days, the two ends of the shed can be properly opened at night for ventilation. After 15 days, the hyphae in the material are basically full and can be covered with soil. Covering with wet soil mixed with chaff. Cover coarse soil and fine soil evenly on the material surface in several times. When the hyphae grow on the soil cracks, heavy water is sprayed once to promote the mushrooms to grow rapidly. During the whole mushroom growing period, the water is managed by light spraying and frequent spraying to keep the humidity of the covering soil. After the beginning of spring, the temperature rises. Pay attention to increasing the amount of water spray, and strive to produce more spring mushrooms. In April, when the mushroom planting in the whole rice field is over, the herringbone shed can be removed, and the mushroom residue can be scattered in the rice field, and the mushroom residue in 667 square meters can be scattered in 2700~3300 square meters. Mushroom residue is a good organic fertilizer, which can increase rice yield and reduce the application amount of chemical fertilizer. Planting mushrooms in rice fields is a good way to develop rice field resources and guide farmers to get rich.