NOVELTY - Nano fertilizer comprises Bacillus megaterium, L-lactic acid, microbial inoculum, organic fertilizer, inorganic fertilizer, fertilizer, adhesive, auxiliary agent, Artemisia rupestris, semen momordicae, Japanese Stellera chamaejasme, hops, matrine, golden larch bark, pepper, Ginkgo, common Cnidium fruit, cortex meliae, quisqualis, Chinese gall, ilex pubescens, soapberry seed coat, fructus ulmi, camphor, and silicon-substituted hydroxyapatite.    USE - The nano fertilizer is useful for controlling bacterial wilt of ginger (claimed), improving growth of plant, and protecting the plant by reducing growth of insect.    ADVANTAGE - The nano fertilizer improves crop yield and quality.    DETAILED DESCRIPTION - Nano fertilizer comprises 3-6 pts. wt. of Bacillus megaterium, 1-4pst. wt. of L-lactic acid, 5-8pst. wt. of microbial inoculum, 900-1000 pts. wt. of organic fertilizer, 440-480 pts. wt. of inorganic fertilizer, 40-50 pts. wt. of fertilizer, 30-32 pts. wt. of adhesive, 0.4-0.6 pts. wt. of auxiliary agent, 45-55 pts. wt. of Artemisia rupestris, 40-50 pts. wt. of semen momordicae, 1-15 pts. wt. of Japanese Stellera chamaejasme, 5-10 pts. wt. of hops, 5-10 pts. wt. of matrine, 10-15 pts. wt. of golden larch bark, 20-30 pts. wt. of pepper, 20-30 pts. wt. of Ginkgo, 20-30 pts. wt. of common Cnidium fruit, 10-30 pts. wt. of cortex meliae, 15-25 pts. wt. of quisqualis, 1-15 pts. wt. of Chinese gall, 5-15 pts. wt. of ilex pubescens, 55-60 pts. wt. of soapberry seed coat, 10-15 pts. wt. of fructus ulmi, 5-15 pts. wt. of camphor, and 25-30 pts. wt. of silicon-substituted hydroxyapatite. An INDEPENDENT CLAIM is included for preparing nano fertilizer comprising fermenting and culturing Bacillus megaterium and L-lactic acid, then inoculating in a potato dextrose agar (PDA) culture medium, adjusting the pH value to 6.2-6.8, and controlling temperature at 25-32 degrees C for 35-45 hours to prepare bacterial suspension, inoculating 1% of bacterial suspension in the PDA liquid culture medium, shaking the culture at 25-32 degrees C, culturing for 6-9 days until the spore amount reaches less than or equal to 5x 109/mm, adding the crop, plant straw and animal feces, uniformly stirring, adding 50-60% of water to obtain organic fertilizer, adding the microbial inoculum to purified water in a weight ratio of 1-2:45, uniformly stirring at a temperature of 20-30 degrees C for 4-10 hours to obtain activated solution, adding the activating solution into the pre-processed organic fertilizer, uniformly stirring, piling at 0.5-0.8 m or 0.8-1.2 m, controlling the temperature to 50-55 degrees C for more than one time, stopping the reaction when stack temperature reaches 65 degrees C, then standing in decomposed state after 10-14 days, adding inorganic fertilizer, fertilizer, adhesive, auxiliary agent and pesticide, respectively, adding water to dissolve, uniformly mixing and stirring to obtain material, and adding rest of the above raw materials, fluidized bed drying, crushing, peleting and then sieving.