Various enzymes produced by the Basidiomycetes, i.e. Pleurotus ostreatus, Pholiota nameko and Flammulina velutipes have been analysed. The purpose of the analyses is to produce a nutritious fertilizer from saw dust, sweet potato stems, corn stems and barley stems which are known as the farm product waste materials. The results of the analyses are as follows: 1. In order for P. ostreatus, Pho. nameko and F. velutipes to grow properly, the saw dust of broad-leaved trees, poplar and chestnut were mixed with sweet-potato stems, corn stems and barley straws at the ratio of $42{sim}49;:;30$, and then to this mixture was added rice bran at the ratio of $18{sim}35;:;30$ The following proved to be optimum conditions for the growth in this test: the parcentage of water content $60{sim}70%$, $24{sim}26^{circ}C$ degrees of temperature. 2. We analyzed the fiber contained in the above materials after 20 days growth in various media. We found out that the fiber was decomposed up to $47{sim}50%$ and polysaccharified. Lignin was decomposed up to $20{sim}25%$ and about three times as much protein was contained in the product as in the original materials. 3. Our analyses revealed the possibility of producing concentrated feed from the crude fiber.