雙(shuang)孢(bao)菇(gu)栽(zai)培(pei)過(guo)程(cheng)中(zhong)和(he)其(qi)他(ta)食(shi)用(yong)菌(jun)最(zui)大(da)的(de)不(bu)同(tong)是(shi)需(xu)要(yao)覆(fu)土(tu)。不(bu)覆(fu)土(tu)則(ze)不(bu)出(chu)菇(gu)或(huo)很(hen)少(shao)出(chu)菇(gu)。雙(shuang)孢(bao)菇(gu)在(zai)栽(zai)培(pei)條(tiao)件(jian)下(xia)，由(you)菌(jun)絲(si)體(ti)的(de)生(sheng)長(chang)轉(zhuan)向(xiang)子(zi)實(shi)體(ti)的(de)發(fa)育(yu)過(guo)程(cheng)
，覆(fu)土(tu)是(shi)一(yi)個(ge)重(zhong)要(yao)的(de)誘(you)導(dao)因(yin)素(su)。覆土在雙孢菇生長過程中的作用如下：1.futucengzailiaomiankeyizaochengyigewenshidujiaoweiwendingdexiaoqihou，youliyujunleidexingcheng。futuyihou

，shiluoludeliaomianzengjialeyicengbaohuceng，jinenghuanhewendudebianhua
，younengjiangdishuifendezhengfa

，shidetucengneiyouyigejiaoweiwendingdexiaoqihouhuanjing。2.futuhougaibianleliaomianhetucengeryanghuatanheyangqidebili，cujinjunsiniujiechengzishiti。mogujunsitihezishitiduieryanghuatandenaishoulishiyouchayide。futuyihouyinqiliaomianhetucengzhongeryanghuatanhanliangdebianhua，congerkongzhimogujunsizaitucengzhongdeshengchang，shizhijishixingchengjunlei。3.覆(fu)土(tu)後(hou)改(gai)變(bian)了(le)營(ying)養(yang)條(tiao)件(jian)，促(cu)進(jin)菌(jun)絲(si)在(zai)營(ying)養(yang)較(jiao)差(cha)的(de)土(tu)層(ceng)中(zhong)由(you)營(ying)養(yang)生(sheng)長(chang)轉(zhuan)向(xiang)生(sheng)殖(zhi)生(sheng)長(chang)。蘑(mo)菇(gu)菌(jun)絲(si)在(zai)營(ying)養(yang)豐(feng)富(fu)的(de)培(pei)養(yang)料(liao)內(nei)生(sheng)長(chang)旺(wang)盛(sheng)，當(dang)生(sheng)長(chang)到(dao)覆(fu)土(tu)層(ceng)時(shi)由(you)於(yu)營(ying)養(yang)成(cheng)分(fen)含(han)量(liang)甚(shen)微(wei)，生(sheng)長(chang)就(jiu)受(shou)抑(yi)製(zhi)
，從(cong)而(er)轉(zhuan)向(xiang)生(sheng)殖(zhi)發(fa)育(yu)而(er)結(jie)菇(gu)。4.覆土對料表菌絲的物理性刺激作用
，可促進子實體的形成。這種物理刺激有利於蘑菇菌絲的扭結和分化。5.futucengkesuishigonggeimogushengchangsuoxudedaliangshuifen。mogushengchangfayuguochengzhongdezhouqixingbianhua，jiaoqitashiyongjungengweituchumingxian。yincichuguwangqixuyaobuchongdaliangdeshuifen

，gongmoguxishou。jiarumeiyoutuceng
，liaomiannanyichengshouzheyangdedaliangdeshuifen，ertucengjinengxishouzhucunzheyangduodeshuifen，kongxijianyouyouzugoudekongqigongmoguxishou，yinernengweichimogudezhengchangshengchangfayu。6.覆土層可支持蘑菇子實體的正常生長。蘑菇子實體在裸露的料麵上無法正常直立生長，而覆土層卻起到了一種支撐子實體生長的作用。