NOVELTY - A slow release organic fertilizer comprises 5-6 pts. wt. ocher, 55-65 pts. wt. cow dung, 3-4 pts. wt. calamine, 2-3 pts. wt. urea, 3-4 pts. wt. zinc sulfate, 15-25 pts. wt. kaolin, 6-8 pts. wt. Hydrilla verticillata powder, 3-4 pts. wt. spodumene powder, 4-5 pts. wt. ammonium dihydrogen phosphate, 2-3 pts. wt. potassium persulfate, 10-12 pts. wt. rice straw, 5-6 pts. wt. soybean oil cake, 3-4 pts. wt. illite powder, 8-10 pts. wt. sawdust, 20-30 pts. wt. soil conditioner, 4-5 pts. wt. effective microorganism (EM) agent and predetermined amount of water.    USE - Slow release organic fertilizer is used for growing rice in different period.    ADVANTAGE - The environmentally-friendly slow release organic fertilizer has controlled particle size, and suppresses heavy metal pollution and pesticide residues in soil.    DETAILED DESCRIPTION - A slow release organic fertilizer comprises 5-6 pts. wt. ocher, 55-65 pts. wt. cow dung, 3-4 pts. wt. calamine, 2-3 pts. wt. urea, 3-4 pts. wt. zinc sulfate, 15-25 pts. wt. kaolin, 6-8 pts. wt. Hydrilla verticillata powder, 3-4 pts. wt. spodumene powder, 4-5 pts. wt. ammonium dihydrogen phosphate, 2-3 pts. wt. potassium persulfate, 10-12 pts. wt. rice straw, 5-6 pts. wt. soybean oil cake, 3-4 pts. wt. illite powder, 8-10 pts. wt. sawdust, 20-30 pts. wt. soil conditioner, 4-5 pts. wt. effective microorganism (EM) agent and predetermined amount of water. The soil conditioner is prepared by mixing 5-6 pts. wt. iron chelated ethylenediamine-N,N'-bis(2-hydroxyphenylacetic acid), 5-6 pts. wt. copper chelated amino acid, 5-6 pts. wt. magnesium chelated amino acid, 5-6 pts. wt. calcium chelated amino acid, 5-6 pts. wt. boron chelated amino acid, 5-6 pts. wt. manganese chelated amino acid and 5-6 pts. wt. zinc chelated amino acid, grinding mixed material into fine powder (A), mixing 40-60 pts. wt. beer sludge and 20-30 pts. wt. sawdust, adding 4-5 pts. wt. EM agent and 8-12 pts. wt. Agaricus blazei mushroom residue, adjusting water content to maximum water holding capacity of 60-70%, aerobically processing resultant mixture at high temperature for 6-8 days, fermenting at 50-60 degrees C for 25-35 days, drying fermented beer sludge composite material, pulverizing, mixing obtained material with powder (A), spray-granulating mixed powder into spherical particles, with 10-15 pts. wt. urea, spray-coating 2-3 pts. wt. polyacrylamide and 1-2 pts. wt. potassium feldspar powder on the outer surface of the particles, drying and cooling. An INDEPENDENT CLAIM is included for preparation of slow release organic fertilizer.