NOVELTY - Fertilizer comprises 40-60 kg/acre oil cake, 100-250 kg/acre vinasse organic fertilizer, 15-25 kg/acre calcium magnesium phosphate, 40-60 kg/acre potash magnesium sulfate fertilizer, and 5-7 kg/acre bamboo charcoal organic fertilizer. The oil cake has moisture content of 14% and nitrogen content of 6.3% (dried sample). The vinasse organic fertilizer has moisture content of 35.6% and nitrogen content of 2.8% (dried sample). The calcium magnesium phosphate fertilizer has phosphorus pentoxide content of less than or equal to 15%.    USE - The fertilizer is useful for planting flue-cured tobacco plants in karst regions (all claimed).    ADVANTAGE - The fertilizer is cost-effective, and applied at a time in the form of base fertilizer without supplementing fertilizer in the later period, and enables to increase potassium content and reduce nicotine content in flue-cured tobacco.    DETAILED DESCRIPTION - Fertilizer comprises 40-60 kg/acre oil cake, 100-250 kg/acre vinasse organic fertilizer, 15-25 kg/acre calcium magnesium phosphate, 40-60 kg/acre potash magnesium sulfate fertilizer, and 5-7 kg/acre bamboo charcoal organic fertilizer. The oil cake has moisture content of 14% and nitrogen content of 6.3% (dried sample). The vinasse organic fertilizer has moisture content of 35.6% and nitrogen content of 2.8% (dried sample). The calcium magnesium phosphate fertilizer has phosphorus pentoxide content of less than or equal to 15%. The potash magnesium sulfate fertilizer has potassium oxide content of less than or equal to 22% and magnesium content of less than or equal to 5%. The bamboo charcoal has water content of 6.9% and nitrogen content of 13.9% (dried sample). The oil cake is obtained by drying residue of rapeseed after extraction of oil. The vinasse organic fertilizer is obtained by collecting waste from brewery production, inoculating Bacillus amyloliquefaciens and B.mojavensis, mixing uniformly, stacking mixture, performing fermentation at 60-65 degrees C for 1-2 months, turning mixture, maintaining temperature at 65 degrees C, crushing fermented material, and sieving crushed material. The calcium magnesium phosphate fertilizer and potash magnesium sulfate fertilizer are commercially available product. An INDEPENDENT CLAIM is included for method for using the fertilizer, which involves (a) deep plowing soil, cleaning plastic film and weeds, and tillting to a depth of 25-35 cm, (b) applying basal fertilizer 15-20 days before planting flue-cured tobacco, applying fertilizer containing oil cake, vinasse organic fertilizer, calcium magnesium phosphate, potash magnesium sulfate fertilizer, and bamboo charcoal organic fertilizer, then adding fertilizer containing tobacco organic fertilizer, and vinasse organic fertilizer and bamboo charcoal rganic fertilizer, mixing uniformly, applying rough soil towards unwinding direction as strips on surface of soil, and applying manure evenly, (c) constructing ridge, and (d) transplanting seedlings.