NOVELTY - Fertilizer synergist comprises modified rock phosphate powder (60-80 pts. wt.), brassin formulations (1-2 pts. wt.), zeolite (40-50 pts. wt.), ash (8-12 pts. wt.), mushroom residue (16-18 pts. wt.), ammonium nitrate (5-7 pts. wt.), calcium phosphate (4-6 pts. wt.), attapulgite clay (3-4 pts. wt.), and water. Modified phosphate rock comprises rock phosphate powder (90-110 pts. wt.), gamma-polyglutamate powder (1-2 pts. wt.), ferrous sulfate (4-8 pts. wt.), calcium bicarbonate (6-9 pts. wt.), Bacillus subtilis (2-3 pts. wt.), and silicate bacteria (3-4 pts. wt.).    USE - Fertilizer synergist used for improving quality of rapeseed (claimed).    ADVANTAGE - The fertilizer synergist ensures increased growth and resistance of rapeseed plants, and improves soil environment, and promotes root growth. The fertilizer synergist increases efficiency and duration of action of nutrients, and economic benefits, and reduces cost.    DETAILED DESCRIPTION - Fertilizer synergist comprises modified rock phosphate powder (60-80 pts. wt.), brassin formulations (1-2 pts. wt.), zeolite (40-50 pts. wt.), ash (8-12 pts. wt.), mushroom residue (16-18 pts. wt.), ammonium nitrate (5-7 pts. wt.), calcium phosphate (4-6 pts. wt.), attapulgite clay (3-4 pts. wt.), and water. Modified phosphate rock comprises rock phosphate powder (90-110 pts. wt.), gamma-polyglutamate powder (1-2 pts. wt.), ferrous sulfate (4-8 pts. wt.), calcium bicarbonate (6-9 pts. wt.), Bacillus subtilis (2-3 pts. wt.), silicate bacteria (3-4 pts. wt.), EDTA-chelated copper (18-22 pts. wt.), manganese humate (24-26 pts. wt.), black liquor (13-17 pts. wt.), and corn starch (35-45 pts. wt.). Modified phosphate rock is prepared by heating black liquor to facilitate its concentration, and then adding phosphate rock. Obtained mixture is calcined at 400-500 degrees C, and then mixed with gamma-polyglutamate powder, EDTA-chelated copper, manganese humate, and corn starch. Obtained mixture is sieved by 150 mesh sieve, and then mixed with water and ferrous sulfate at 40-60 degrees C. Calcium bicarbonate is added to obtained mixture, and then heated at 60-70 degrees C under stirring condition for 30 minutes. Obtained mixture is cooled. Bacillus subtilis and silicate bacteria are dded to cooled product, and kept at 20-30 degrees C for 7-8 days. Obtained mixture is air-dried and pulverized by 100-120 mesh sieve to obtain fine powder. An INDEPENDENT CLAIM is included for a method for preparing fertilizer synergist, which involves:    (A) calcining zeolite at 650-850 degrees C for 2-3 hours;    (B) pulverizing calcined zeolite by 100 mesh sieve;    (C) fermenting brassin preparations, ash, mushroom residue and water in fermentation tank at 40-50 degrees C for 3-4 weeks;    (D) pulverizing fermented product to obtain fine powder;    (E) mixing fine powder, attapulgite and zeolite powder;    (F) adding remaining ingredients to obtained mixture; and    (G) pulverizing obtained mixture by 70-90 mesh sieve to obtain the final product.