Currently in the Moyobamba province is the rice cultivation, whose activity is the livelihood of many people, of this crop mainly originates as residual material the rice husks. Nowadays it is advisable restores residual materials to the productive cycles, which contributes to the natural resources saving, to the reduction in the residues generation and to the decrease of the environmental impact that they could generate for an inadequate disposition. To use agricultura! residues as substratum for the culture of eatable fungi is a clear example of residues valuation. In this context, it is necessary to evaluate if the rice husk can be in use as substratum for the culture of these foodstuffs (Pleurotus ostreatus), determining its parameters ofproductivity, physical properties of the substratum For it there were pro ved three rice husk proportions (97 %, 87 % and 82 %) having as witness st...