<![CDATA[White oyster mushroom (Pleurotus ostreatus) is a very popular food. Selenium is one of the essential micronutrients for human. The intake of selenium is low. The aim of this research is to analyze some factors that affect to selenium fortification on white oyster mushrooms. White oyster mushrooms are saprophytic plants that absorb their food from their growing media, so the growth periode and their fruit body content is influenced by the composition and the acidity (pH) of their growing media. This paper describes about the effect of acidity (pH) and the harvesting time on the selenium content of oyster mushroom. From the results, we concluded that the most rapid growth of mycelium occurred on the oyster mushroom that grown on growing media with pH 8. The selenium content of mushroom fruit body are influenced by their mycelia growing period, the oyster mushroom that grown on growing media with pH 6 had the highest selenium content ,and there is significant difference between the content of selenium of the mushroom fruit body that collected from the first and second harvesting time.]]>
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