NOVELTY - Preparation of organic fertilizer, involves (a) (i) pretreating excrement with vegetable materials to regulate the hardness of excrement, (ii) piling the pretreated excrement and subjecting piled material to primary fermentation such that the excrement is partially decomposed and fermented, (iii) subjecting primary processed excrement to secondary fermentation after addition of rice bran and microbial broth, and (iv) finally performing tertiary fermentation of the secondary processed excrement using microbial compost.    USE - Preparation of organic fertilizer used for cultivating crops, preferably peony and rose (all claimed), and providing disease resistance to plants.    ADVANTAGE - The organic fertilizer has reduced offensive odor, and improves yield, flower size and fruits of crops.    DETAILED DESCRIPTION - Preparation of organic fertilizer, involves (a) (i) pretreating excrement with vegetable materials to regulate the hardness of excrement, (ii) piling the pretreated excrement and subjecting piled material to primary fermentation such that the excrement is partially decomposed and fermented, (iii) subjecting primary processed excrement to secondary fermentation after addition of rice bran and microbial broth, and (iv) finally performing tertiary fermentation of the secondary processed excrement using microbial compost, or (b) digging hole in mountain field or agricultural field, adding fallen leaves or food leftovers into the hole, adding microbial broth into the hole, covering the hole with air-permeable sheet, fermenting the mixture, then adding filamentous fungi into the hole and processing the mixture. INDEPENDENT CLAIMS are included for the following:    (1) organic fertilizer prepared by the above-cited method; and    (2) cultivation of crops, involves spreading the above-cited organic fertilizer as basal fertilizer before winter or sowing, then spreading slaked lime before blooming, and finally spreading compound fertilizers during ovary development, where the compound fertilizers comprise mixture of magnesia, phosphorus and potash in a weight ratio of 2-3:20:15.