The application of raw gypsum in edible fungi culture medium belongs to auxiliary material, which is a kind of substance used to increase nutrition and improve chemical and physical state with small dosage. The addition of gypsum in edible fungi culture medium ranged from 1% to 3%.

　　食用菌培養基中添加生石膏在增加營養方面的作用：

　　The effect of adding raw gypsum in edible fungi culture medium on increasing nutrition:

　　（1）直接補充培養基中硫、鈣的不足；

　　(1) Direct supplementation of sulphur and calcium in the medium;

　　（2）使氣態氮固定成化合態氮，利于游離在堆料中氨氣的穩定，減少培養基中氮素損失；

　　(2) Fixing gaseous nitrogen into combined nitrogen is beneficial to the stabilization of free ammonia in the stack and the reduction of nitrogen loss in the medium.

　　（3）能加速培養基中機質的分解，促進料中可溶性磷、鉀的釋放，供給菌絲吸收利用；

　　(3) It can accelerate the decomposition of organic matter in the medium, promote the release of soluble phosphorus and potassium in the feed, and supply the mycelium for absorption and utilization.

　?。?）鈣離子能使堆肥中的膠體膜消失，有利于蘑菇菌絲吸收營養；

　　(4) Calcium ion can make the colloidal film disappear in compost, which is beneficial for mushroom mycelium to absorb nutrients.

　?。?）生石膏能中和蘑菇菌絲在生長過程中產生的草酸，并在蘑菇菌絲表面形成有草酸鈣的細胞膜，有防御外敵、保護菌絲的作用 ；

　　(5) Gypsum can neutralize the oxalic acid produced by mushroom mycelium during its growth, and form a cell membrane with calcium oxalate on the surface of mushroom mycelium, which has the function of defending foreign enemies and protecting mycelium.

　?。?）使基料在發酵后纖維素降解率提高，可溶性糖增加。

　　(6) The degradation rate of cellulose and soluble sugar increased after fermentation.