NOVELTY - Fertilizer synergistic agent comprises 12-14 pts. wt. livestock manure, 20-22 pts. wt. rapeseed cake, 8-10 pts. wt. chaff bran ash, 42-48 pts. wt. bentonite, 60-80 pts. wt. modified powdered rock phosphate, 6-8 pts. wt. bagasse, 4-5 pts. wt. calcium carbonate powder, 3-4 pts. wt. attapulgite, and water (required amount). The modified powdered rock phosphate comprises e.g. 90-110 pts. wt. powdered rock phosphate, 1-2 pts. wt. gamma -poly(glutamic acid) powder, 6-9 pts. wt. calcium bicarbonate, 2-3 pts. wt. Bacillus subtilis, and 18-22 pts. wt. EDTA chelated copper.    USE - The synergistic agent is used for enhancing peanut root nutrient accumulation (claimed).    ADVANTAGE - The synergistic agent favors the accumulation of nitrogen, phosphorus, and manganese, has synergistic effect, and increases soil water-retaining effect of soil.    DETAILED DESCRIPTION - Fertilizer synergistic agent comprises 12-14 pts. wt. livestock manure, 20-22 pts. wt. rapeseed cake, 8-10 pts. wt. chaff bran ash, 42-48 pts. wt. bentonite, 60-80 pts. wt. modified powdered rock phosphate, 6-8 pts. wt. bagasse, 4-5 pts. wt. calcium carbonate powder, 3-4 pts. wt. attapulgite, and water (required amount). The modified powdered rock phosphate comprises 90-110 pts. wt. powdered rock phosphate, 1-2 pts. wt. gamma -poly(glutamic acid) powder, 4-8 pts. wt. ferrous sulfate, 6-9 pts. wt. calcium bicarbonate, 2-3 pts. wt. Bacillus subtilis, 3-4 pts. wt. silicate inoculant, 18-22 pts. wt. EDTA chelated copper, 24-26 pts. wt. humic acid manganese salt, 13-17 pts. wt. paper-making black liquor, and 35-45 pts. wt. corn starch. The preparation of modified powdered rock phosphate comprises heating paper making black liquor, evaporating, concentrating to solid state after adding powdered rock phosphate, baking mixture at 400-500 degrees C, adding baked product and gamma -polyglutamic acid fine powder, grinding, adding EDTA chelated copper, humic acid manganese salt, corn starch mixture, passing through 150 meshes sieve to obtain mixed powder, adding water and stirring uniformly, adding ferrous sulfate, heating mixing liquid to 40-60 degrees C, chelating for 20 minutes, adding calcium bicarbonate, stirring evenly, adding mixing liquid, heating to 60-70 degrees C, chelating for 30 minutes, stirring uniformly, cooling to room temperature to obtained mixture liquid, adding Bacillus subtilis microbial inoculum and silicate inoculant, placing for 7-8 days in below 20-30 degrees C, taking the solid of mixed liquid, naturally drying the microbial inoculum and grinding into fine powder, passing through 100-120 meshes sieve to obtain the modified phosphate. An INDEPENDENT CLAIM is also included for preparing fertilizer synergistic agent comprising (i) taking bentonite, high temperature sintering at 450-600 degrees C for 2-3 hours, cooling, taking out, grinding into fine powder, passing through 100 meshes sieve, (ii) taking poultry manure, rape seed cake, rice husk ash chaff, and bagasse, mixing in ferment pool, adding water, maintaining temperature in the fermentation reactor at 40-45 degrees C, fermenting for 3-4 weeks, taking out, drying and grinding into fine powder, (iii) taking bentonite and fermented powder, mixing, adding attapulgite clay, stirring uniformly, adding ferment powder, adsorbing on bentonite powder, and (iv) using material obtained in the step (iii), modified powdered rock phosphate, calcium carbonate powder and remaining material, mixing uniformly, grinding through 80-100 meshes sieve, taking the mixed powder, weighing, and package to obtain the synergistic agent.