NOVELTY - Slow release fertilizer synergistic agent comprises 3-4 pts. wt. urea, 4-5 pts. wt. ammonium sulfate, 14-16 pts. wt. monoammonium phosphate, 18-22 pts. wt. fish residue, 20-25 pts. wt. moss coal, 12-15 pts. wt. cotton seed hull, 22-25 pts. wt. powder humic acid, 2-4 pts. wt. sustained release microbial layer, 4-5 pts. wt. sustained release trace element chelated layer, 6-9 pts. wt. sustained release phosphorus ore powder micro-crystalline film layer and balanced amount of water. Sustained release microbial layer comprises 5-7 pts. wt. effective micro-organism inoculum.    USE - Slow release fertilizer synergistic agent used for growing corn (claimed).    ADVANTAGE - The slow release fertilizer synergistic agent increases soil permeability, prevents soil plate structure, enhances corn root system development and improves yield of corn.    DETAILED DESCRIPTION - Slow release fertilizer synergistic agent comprises 3-4 pts. wt. urea, 4-5 pts. wt. ammonium sulfate, 14-16 pts. wt. monoammonium phosphate, 18-22 pts. wt. fish residue, 20-25 pts. wt. moss coal, 12-15 pts. wt. cotton seed hull, 22-25 pts. wt. powder humic acid, 2-4 pts. wt. sustained release microbial layer, 4-5 pts. wt. sustained release trace element chelated layer, 6-9 pts. wt. sustained release phosphorus ore powder micro-crystalline film layer and balanced amount of water. Sustained release microbial layer comprises 5-7 pts. wt. effective micro-organism inoculum, 45-55 pts. wt. diatomite and 120-140 pts. wt. sugar water. Sustained release trace element chelated layer comprises 24-26 pts. wt. attapulgite, 16-18 pts. wt. waste animal fur, 4-7 pts. wt. ferrous sulfate and 3-5 pts. wt. zinc sulfate. Sustained release phosphorus ore powder micro-crystalline film layer comprises 28-32 pts. wt. rock phosphate, 8-10 pts. wt. bone glue and water. An INDEPENDENT CLAIM is included for a method for preparing slow release fertilizer synergistic agent, which involves:    (A) mixing fish residue, moss coal and cotton seed hull;    (B) fermenting obtained mixture with water for 3-4 weeks;    (C) drying and crushing fermented material;    (D) spraying sustained release phosphorus ore powder micro-crystalline film layer on obtained particle to obtain inner layer;    (E) mixing monoammonium phosphate, humic acid powder and water with obtained granule;    (F) centrifuging granule for 20 minutes with sustained release trace element chelated layer to obtain middle layer;    (G) mixing urea, ammonium sulfate and water uniformly with obtained particle;    (H) spraying mixture of sustained release microbial layer, remaining components and water on obtained granule to obtain outer layer; and    (I) drying obtained granule at 40-50 degrees C to obtain product.