NOVELTY - Fertilizer comprises 24-32 pts. rice husk ash, 40-60 pts. dry turf soil, 10-12 pts. sodium alginate, 6-8 pts. peanut shell, 4-5 pts. monoammonium phosphate, 3-4 pts. urea-formaldehyde, 8-12 pts. potassium chloride, 6-8 pts. zinc sulfate, 5-7 pts. tobacco leaves, 5-6 pts. turnip, 12-16 pts. attapulgite, 5-6 pts. biogas-liquid, 28-36 pts. humus, 10-14 pts. garden soil, 3-4 pts. JT strain, 4-5 pts. soil modifying agent and proper amount of vegetable washed water. The soil modifying agent includes e.g. borax, diatomite, raw oyster shell, biogas slurry, iron ore tailing slag and sea pumice.    USE - The fertilizer is useful for potassium-enriched strawberries (claimed).    ADVANTAGE - The fertilizer has sustained release effect with minimal dosage amount, continuously supply nutrients to strawberries, and is economical.    DETAILED DESCRIPTION - Fertilizer comprises 24-32 pts. rice husk ash, 40-60 pts. dry turf soil, 10-12 pts. sodium alginate, 6-8 pts. peanut shell, 4-5 pts. monoammonium phosphate, 3-4 pts. urea-formaldehyde, 8-12 pts. potassium chloride, 6-8 pts. zinc sulfate, 5-7 pts. tobacco leaves, 5-6 pts. turnip, 12-16 pts. attapulgite, 5-6 pts. biogas-liquid, 28-36 pts. humus, 10-14 pts. garden soil, 3-4 pts. JT strain, 4-5 pts. soil modifying agent and proper amount of vegetable washed water. The soil modifying agent includes 3-4 pts. borax, 30-40 pts. diatomite, 5-6 pts. raw oyster shell, 4-6 pts. biogas slurry, 10-12 pts. iron ore tailing slag, 8-10 pts. sea pumice, 14-18 pts. kanuma soil, 2-3 pts. manganese sulfate, 6-8 pts. sodium polyacrylate, 8-10 pts. sodium alginate, 10-16 pts. zinc sulfate, 8-14 pts. ammonium molybdate, 15-20 pts. bamboo charcoal, 6-7 pts. water and 3-4 pts. Camellia oil. The soil modifying agent is prepared by mixing zinc sulfate, ammonium molybdate and bamboo charcoal, drying, grinding into fine powder, then mixing with sodium polyacrylate and extruding into granules, mixing biogas slurry and sodium alginate with water and stirring to obtain slurry, then adding manganese sulfate and borax into slurry, stirring uniformly, heating under low flame for 10-30 minutes and coating on resultant granules, grinding the diatomite, oyster shell, iron ore tailings, sea pumice and kanuma soil into fine powder, sieving via 80-120 meshes sieve, drop-wisely adding Camellia oil into it, stirring uniformly, mixing with resultant coated granules and air-drying. An INDEPENDENT CLAIM is also included for preparing fertilizer, comprising: (i) mixing the dry turf soil, biogas-liquid, humus, peanut shell and sodium alginate, sprinkling vegetable washed water to wet the mixture, adding JT strain and carrying out aerobic fermentation for 20-25 days at room temperature by turning once for every 3-5 days, then drying the fermented material and granulating; (ii) grinding monoammonium phosphate, urea-formaldehyde, potassium chloride and zinc sulfate into powder; (iii) mixing and crushing the tobacco leaves and turnip, then mixing with attapulgite, garden soil and rice husk ash by adding little vegetable washed water and stirring into paste, drying the paste and granulating; and (iv) uniformly mixing the resultant material of step (iii) with remaining material, then packaging into bags.