NOVELTY - Preparation of fertilizer involves mixing substrate (90-99.5%) and growth substance (10-0.5). The growth substance is prepared by mixing indolebutyric acid and alpha -pimacol at weight ratio of 2:1, and mixing 160-mesh calcium carbonate powder (99 times of mixture weight). The substrate is prepared by piling and fermenting corn straws.    USE - Method for preparing fertilizer (claimed).    ADVANTAGE - The method is simple and easy to operate. The fertilizer ensures rich organic material at the root of each seedling to increase soil fertility, enhances air permeability, and avoids hardening of soil. The fertilized organic material contains beneficial bacteria, prevents reproduction of all kinds of pathogenic bacteria, and reduces seedling diseases. The growth substance promotes cell division and speeds up growth of root.    DETAILED DESCRIPTION - Preparation of fertilizer involves mixing substrate (90-99.5%) and growth substance (10-0.5). The growth substance is prepared by mixing indolebutyric acid and alpha -pimacol at weight ratio of 2:1, and mixing 160-mesh calcium carbonate powder (99 times of mixture weight). The substrate is prepared by: (A) selecting high land as fermentation pile, spreading bar stones at bottom of the pile, keeping 30 cm gap among the bar stones, and ensuring that the pile has width of 3.5 m and length of 15-30 m; (B) putting straw pile near the fermentation pile, cutting corn straws to 5-7 cm, and watering until water content of 60-65%; (C) piling water-containing straws on bar stones and ensuring that the height of piles is 1.5-1.8 m; (D) punching holes on the piles via a tip club with hole distance of 80-100 cm; (E) covering the piles with plastic films; (F) inserting a thermometer in the pile to observe temperature twice a day, and stopping first fermentation period when temperature in the pile does not increase after reaching 65-70 degrees C at the sixth or seventh day; (G) opening the pile with constant temperature, judging that straws are normal when the straws are softened and black and have white mycelia on the surface, transferring fresh Actinomyces, turning over the material after pile opening, supplying water until water content of 60%, putting the material outside to the center to reestablish piles to 130-160 cm, punching and packaging the piles, and inserting the thermometer to start second fermentation period; (H) opening the pile after 2-3 days when the temperature reaches 65 degrees C and is decreasing; and (I) drying at normal temperature until water content of 15-18%, and crushing.