ALBERTO edgardo Omar
Heat treatment of wheat straw by immersion in hot water decreases mushroom yield in Pleurotus ostreatus
JARAMILLO, S.; ALBERTÓ E.
REVISTA IBEROAMERICANA DE MICOLOGIA
ASOCIACION ESPANOLA MICOLOGIA-AEM
Lugar: Londres; Año: 2013
ABSTRACT: Background: The oyster mushroom, Pleurotus ostreatus is cultivated worldwide. It is one of the most appreciated mushrooms due to its high nutritional value. Immersion in hot water is one of the most popular and worldwide treatment used for mushroom farmers. It is cheap and easy to implement. Aims: To compare the yields obtained during mushroom production of P.ostreatus using different pre-treatments: immersion in hot water, sterilization by steam and the use of fungicide to determine if they influence mushroom crop. Methods: Four different treatments of substrate (wheat straw) were carried out: i) immersion in hot water (IHW); ii) steam sterilization; iii) Chemical; iv) Untreated. The residual water from the IHW treatment was used to evaluate the mycelium growth and the production of P. ostreatus. Results: Carbendazim treatment produced highest yields (BE: 106.93 %) meanwhile that IHW produced the lowest BE with 75.83 %. Sugars, N, P, K and Ca were found in residual water of IHW treatment. The residual water increased the mycelium growth but did not increase yields. Conclusions: We have proved IHW treatment of substrate reduced yields at least 20 % when compared with other straw treatments such as steam, chemical or untreated wheat straw. Nutrients like sugars, proteins and minerals were found in the residual water extract which is the resultant water where the immersion treatment is carried out. The loss of these nutrients would be the cause of yield decrease. Alternative methods to the use of IHW as treatment of the substrate should be considered to reduce economical loss.