NOVELTY - Slow controlled release fertilizer comprises 100-300 pts. wt. livestock and poultry excrement, 80-120 pts. wt. wheat straw, 80-120 pts. wt. Enteromorpha, 80-120 pts. wt. plant ash, 10-30 pts. wt. quicklime, 10-30 pts. wt. kaolin, 20-40 pts. wt. cassava slag, 30-50 pts. wt. edible fungus fungus dregs, 40-70 pts. wt. inorganic fertilizer, 10-20 pts. wt. sterilizing component and 20-30 pts. wt. gypsum. The inorganic fertilizer comprises urea, diammonium phosphate, ammonium chloride, potassium calcium chloride, potassium sulfate, gypsum and liquid urea formaldehyde.    USE - Slow controlled release fertilizer used for cultivating potato (claimed).    ADVANTAGE - The slow controlled release fertilizer increases potato yield by 151% and inhibits Streptomyces infection.    DETAILED DESCRIPTION - Slow controlled release fertilizer comprises 100-300 pts. wt. livestock and poultry excrement, 80-120 pts. wt. wheat straw, 80-120 pts. wt. Enteromorpha, 80-120 pts. wt. plant ash, 10-30 pts. wt. quicklime, 10-30 pts. wt. kaolin, 20-40 pts. wt. cassava slag, 30-50 pts. wt. edible fungus fungus dregs, 40-70 pts. wt. inorganic fertilizer, 10-20 pts. wt. sterilizing component and 20-30 pts. wt. gypsum. The inorganic fertilizer comprises urea, diammonium phosphate, ammonium chloride, potassium calcium chloride, potassium sulfate, gypsum and liquid urea formaldehyde in ratio of 1.5:1:1:1.2:1.2:0.2:0.85. The sterilizing component comprises stone-like Omphalia, fructus cnidii, radix sophorae flavescentis, waste tobacco leaf, Melia azedarach and pyrethrum in weight ratio of 1:1:1:4:2:1. An INDEPENDENT CLAIM is included for a method for preparing slow controlled release fertilizer, which involves:    (A) soaking Omphalia, fructus cnidii, radix sophorae flavescentis, waste tobacco leaf and Melia azedarach in water for 2 days    (B) separating solid residue and medicine liquid;    (C) concentrating medicine liquid;    (D) mixing concentrate and liquid urea formaldehyde;    (E) mixing obtained mixture with inorganic fertilizer particle, livestock and poultry excrement, wheat straw, Enteromorpha, plant ash, quicklime, kaolin, cassava slag, edible fungus mushroom and gypsum uniformly;    (F) crushing obtained mixture; and    (G) granulating and pelletizing crushed material in granulator to obtain product.