TECHNOLOGY FOCUS - AGRICULTURE - Preferred Component: The biological fertilizer comprises 40 pts. wt. A. niger culture, 8 pts. wt. solubilizing B. megaterium culture, and 20 pts. wt. B. subtilis culture.    TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Component: The B. subtilis is B. subtilis L1-2013-02 (CGMCC 7926). The A. niger is A. niger (CGMCC 7927). The B. subtilis agent is prepared by accessing B. subtilis seed liquid from inclined plane into fermentation tank; fermenting; concentrating fermentation liquor at low temperature and negative pressure vacuum to 40-50% of its original volume to obtain bacteria concentrated liquid; adding carrier into concentrated liquid at weight ratio of (0.5-0.7):1; uniformly mixing; drying via fluidized bed at 50 degrees C, in which carrier comprises 20-40 pts. wt. calcium carbonate and 10-20 pts. wt. dextrin. The B. subtilis culture is prepared by cultivating B. subtilis strain fermentation liquid via inclined plane to obtain B. subtilis fermentation liquid; accessing B. subtilis slope strain into 500 ml shaking bottle at 100 ml medium loading capacity, rotary table operating at 180 revolutions per minute; culturing at 30 degrees C for 24 hours; accessing 10% inoculum size of first-stage seed into 500 ml second level shaking bottle; culturing under same condition with first level seed culture; accessing 10% inoculum size of second-stage seed into 5000 ml third level shaking bottle at 1000 ml medium loading capacity, rotary table operating at 100 revolutions per minute; culturing at 30 degrees C for 24 hours; accessing 10% inoculum size of third-stage seed into 150 liters first-stage seed tank at 100 liters medium loading capacity; culturing at 30 degrees C for 24 hours while stirring at 100 revolutions per minute under ventilation quantity (V/V) of 1:0.5, and pressure of 0.05 MPa; accessing 10% inoculum size of first-stage seeding tank strain into 1.5 ton second level seed tank using 1 ton fermenting culture base; and culturing at 28 degrees C for 24 hours while stirring at 100 revolutions per minute and ventilation quantity (V/V) of 1:0.5 and pressure of 0.05 MPa. The B. subtilis culture medium has pH of 6.8 and comprises 6.0% glucose, 1.0% yeast extract, 0.2% peptone, and 1.0% calcium carbonate. The A. niger culture is prepared by culturing A. niger bacteria via solid fermentation; inoculating solid fermentation spore culture at 26-35 degrees C to obtain hypha full culture material; drying via low temperature fluidized bed; and crushing. The A. niger culture is prepared by transferring A. niger culture strain into slant plane culture at 27 degrees C for 3 days for activation; accessing culture medium containing 100 g A. niger strain into 500 ml first-stage triangular flask; culturing at 30 degrees C for days; accessing first-stage seed culture containing 1000 g solid into 5000 ml second-stage triangular flask; culturing at 30 degrees C for 3 days; accessing second-stage seed culture into fermenting tank or pallet; uniformly mixing with culture medium culturing at 26-35 degrees C for 5-7 days under humidity 80-90% while turning once every 10 hours to obtain cultured material; sterilizing cultured material via high-temperature cooking at 121 degrees C for 1 hour; drying via fluidized bed at 60 degrees C until moisture content is less than 10%; and crushing material into 60 meshes pore size. The A. niger culture medium has neutral pH and comprises equal volume of water and solid material, in which solid material comprises 70 mass% wheat bran, 15 mass% crushed crop straw, 5 mass% soybean meal, and 10 mass% corn starch. ACTIVITY - Fertilizer.