NOVELTY - Organic crop fertilizer comprises urea, clam shell, razor clam shell, oyster shell, Venerupis philippinarum shell, humic acid magnesium chelate, humic acid zinc chelate, ammonium chloride, potassium sulfate, ammonium sulfate, ammonium dihydrogen phosphate, potassium sulfate, sodium selenate, ferrous sulfate, effective microorganisms (EM), water, and soil modifying agent comprising albic soil, kanuma soil, birch sawdust, maple leaves, fresh and tender bush, big leaf Crotalaria, fulvic acid, nano-carbon powder, zinc gluconate, water hyacinth and calcium hydrophosphate.    USE - The organic crop fertilizer is useful for (claimed).    ADVANTAGE - The fertilizer completely satisfies calcium requirement of crops (claimed); provides organic calcium source to the crops; is an efficient fertilizer due to microbial inoculum; reduces dosage of fertilizer, thus saving the resources and protecting environment; and has good economic, ecological and social benefits.    DETAILED DESCRIPTION - Organic crop fertilizer comprises 20-34 pts. wt. urea, 20-30 pts. wt. clam shell, 12-18 pts. wt. razor clam shell, 10-16 pts. wt. oyster shell, 8-12 pts. wt. Venerupis philippinarum shell, 6-8 pts. wt. humic acid magnesium chelate, 6-8 pts. wt. humic acid zinc chelate, 5-6 pts. wt. ammonium chloride, 5-6 pts. wt. potassium sulfate, 4-6 pts. wt. ammonium sulfate, 3-5 pts. wt. ammonium dihydrogen phosphate, 4-5 pts. wt. potassium sulfate, 4-5 pts. wt. sodium selenate, 3-4 pts. wt. ferrous sulfate, 4-5 pts. wt. effective microorganisms (EM), water, and soil modifying agent comprising 18-24 pts. wt. albic soil, 14-18 pts. wt. kanuma soil, 10-15 pts. wt. birch sawdust, 9-16 pts. wt. maple leaves, 8-12 pts. wt. fresh and tender shrub, 6-8 pts. wt. big leaf Crotalaria, 6-7 pts. wt. fulvic acid, 5-8 pts. wt. nano-carbon powder, 4-7 pts. wt. white radish, 5-6 pts. wt. zinc gluconate, 4-6 pts. wt. water hyacinth, 4-6 pts. wt. soil Ampelopsis, 3-5 pts. wt. calcium hydrophosphate and 4-5 pts. wt. calcium cyanamide. The preparation of soil modifying agent comprises mixing kanuma soil and albic soil, calcining for 40-60 minutes, grinding into fine powder, squeezing water hyacinth, soil Ampelopsis and big leaf Crotalaria wrapped in a white cloth, mixing the slurry with fine powder, calcium hydrophosphate, calcium cyanamide and zinc gluconate, stirring to obtain uniform paste, crushing fresh and tender shrub to obtain residue, taking fulvic acid, white radish peel, birch sawdust and maple leaves into a water pit, composting for 15-20 days, adding nano-carbon powder for 2-4 days/day, stirring uniformly to form compost product, mixing, drying and granulating. An INDEPENDENT CLAIM is also included for preparing the fertilizer, comprising (a) introducing clam shell, razor clam shell, oyster shell and Venerupis philippinarum shell into charcoal fire, calcining, grinding into fine powders, adding water, boiling for 20-40 minutes, spray drying to obtain powder, (b) mixing and pulverizing ammonium chloride, ammonium sulfate, ammonium dihydrogen phosphate, potassium sulfate, sodium sulfate, ferrous sulfate and potassium aluminum sulfate into powder, extruding and granulating, (c) mixing the powder of the step (a) with urea, magnesium humic acid chelate, humic acid chelated zinc and EM microbial inoculum, spraying water and sealing, fermenting for 15-25 days at room temperature, turning once in 3-4 days, (d) drying and granulating the fermented material, mixing with the product of the step (b) and the remaining raw materials.