NOVELTY - Controlled-release fertilizer comprises sodium alginate powder, soybean meal, tobacco dust, charcoal ash, rice straw, corn stalks, biological agent containing effective microorganisms (EM), quartz powder, urea, ammonium carbonate, potassium nitrate, phosphate fertilizer, calcium chloride, borax, alkyd resin, propanol, sodium dodecylbenzenesulfonate, cross-linking agent, and water. The cross-linking agent comprises butyl acrylate, tributyl citrate, rosin powder, green papaya powder, N,N'-methylenebisacrylamide, ethyl alcohol, shellac powder and water.    USE - The controlled-release fertilizer is useful for cultivating pear trees (claimed).    ADVANTAGE - The controlled-release fertilizer is prepared using organic waste material as basic raw material, serves as nitrogen fertilizer that provides more amount of nitrogen as per requirement of pear trees, and contains resinous granules formed by curing effect of alkyd resin, cross-linking agent and other chemical components, which on mixing with organic matter effectively controls concentration of the cross-linking agent and rate of change of degradation of alkyd resin to acquire controlled-release property, and reduce frequency of fertilizer application.    DETAILED DESCRIPTION - Controlled-release fertilizer comprises 30-35 pts. wt. sodium alginate powder, 25-30 pts. wt. soybean meal, 20-24 pts. wt. tobacco dust, 25-28 pts. wt. charcoal ash, 50-70 pts. wt. rice straw, 65-80 pts. wt. corn stalks, 2-3 pts. wt. biological agent containing effective microorganisms (EM), 12-14 pts. wt. quartz powder, 8-12 pts. wt. urea, 8-10 pts. wt. ammonium carbonate, 6-7 pts. wt. potassium nitrate, 7-8 pts. wt. phosphate fertilizer, 4-5 pts. wt. calcium chloride, 7-9 pts. wt. borax, 8-12 pts. wt. alkyd resin, 2-3 pts. wt. propanol, 3-4 pts. wt. sodium dodecylbenzenesulfonate, 5-6 pts. wt. cross-linking agent, and water (suitable quantity). The cross-linking agent comprises 2-3 pts. wt. butyl acrylate, 3-5 pts. wt. tributyl citrate, 2-3 pts. wt. rosin powder, 5-7 pts. wt. green papaya powder, 1-2 pts. wt. N,N'-methylenebisacrylamide, 4-5 pts. wt. ethyl alcohol, 1-2 pts. wt. shellac powder and water (suitable quantity). Preparation method of the above-mentioned cross-linking agent, involves (a) diluting ethyl alcohol by mixing ethyl alcohol and water in a respective ratio of 1:3, adding rosin powder, butyl acrylate, N,N'-methylenebisacrylamide and tributyl citrate to diluted ethyl alcohol solution, and heating obtained solution to 70-90 degrees C for dissolving added components under constant stirring condition, (b) mixing green papaya powder and shellac powder, adding water to obtained mixture in an amount which is 10 times with respect to total weight of the mixture, and stirring solution uniformly, and (c) mixing solutions obtained in the steps (a) and (b), heating mixed solution for 20-30 minutes and concentrating hot solution. An INDEPENDENT CLAIM is included for preparation method of the above-mentioned controlled-release fertilizer, which involves (a) mixing the sodium alginate powder, soybean meal, tobacco dust, charcoal ash, rice straw and corn stalks in the above-mentioned weight proportions, drying obtained mixture, crushing dried product into ultrafine powder of 80 mesh size, adding EM containing biological agent diluted up to 10 times with water to the ultrafine powder, mixing components, adjusting water content of obtained mixture to 35%, and fermenting the mixture at 36-42 degrees C for 15-17 days, where the fermenting mixture is stirred once every 2 days, (b) mixing urea, ammonium carbonate, potassium nitrate, phosphate fertilizer, calcium chloride and borax, adding water to obtained mixture in an amount which is 5-6 times with respect to total weight of the mixture, heating and stirring solution for dissolving added components, adding alkyd resin, sodium dodecylbenzenesulfonate, propanol and cross-linking agent to hot solution, and heating and stirring the solution for 10-15 minutes, (c) adding quartz powder to the solution obtained in the step (b), heating and stirring the solution for 30-40 minutes, cooling stirred solution, allowing solidification to occur naturally, and crushing solidified product into 20 mesh size resinous granules, and (d) mixing fermented product obtained in the step (a) and resinous granules, adjusting water content of obtained product to 20%, and pelletizing obtained mixture.