Proceedings Volume 2010 (format .pdf) - SimpBTH

nitrogen sources, barley bran was the most efficient upon the mycelia growing andfruit mushroom producing at 35-40 g% fresh fungal biomass weight, being closelyfollowed by rice bran at 25–30 g%. Wheat bran is also a well known nitrogensource for fungal biomass synthesis but its efficiency in these experiments wasrelatively lower than that ones induced by the barley and rice bran added as naturalorganic nitrogen sources (Petre & Petre, 2008; Petre & Teodorescu, 2009; Carlile& Watkinson, 1996).100Fungal Biomass Weight (g%)Natural OrganicNitrogen Sources(3% w/w)9080706050403020100P. oL.e.Barley BranWheat BranRice BranP. oL.e.ControlP. oL.e.P. oL.e.Fig. 3. Comparative effects of natural organic nitrogen sources upon mycelia growing of P.ostreatus (P.o.) and L. edodes (L.e.)Among the various mineral sources examined, natural calcium carbonate(CaCO 3 ) from marine shells yielded the best mycelia growing as well as fungalbiomass production at 28-32 g% and for this reason it was registered as the mostappropriate mineral source being followed by natural gypsum (CaSO 4 · 2 H 2 O) at20-23 g%, as it is shown in figure 4. The mineral source hepta-hydrate magnesiumsulfate (MgSO 4 · 7 H 2 O) showed a quite moderate influence upon the fungalbiomass growing as other researchers have already reported so far (Gliessman,1998; Zarnea, 1994; Lamar et al., 1992; Leahy & Colwell, 1990). All data are themeans of triple determinations.81